Nitropyrrolecarboxylicacidethylester; 98%
|
HS Code |
874536 |
| Name | Nitropyrrolecarboxylic acid ethyl ester; 98% |
| Purity | 98% |
As an accredited Nitropyrrolecarboxylicacidethylester; 98% factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 100g of 98% Nitropyrrolecarboxylic acid ethyl ester in sealed chemical - grade packaging. |
| Shipping | Nitropyrrolecarboxylic acid ethyl ester (98%) is shipped in carefully sealed containers, safeguarded against physical damage. Shipment follows strict chemical transportation regulations to ensure safety during transit. |
| Storage | Store "Nitropyrrolecarboxylic acid ethyl ester; 98%" in a cool, dry, well - ventilated area, away from heat sources and ignition sources. Keep it in a tightly - sealed container to prevent moisture absorption and contact with air, which could potentially affect its purity and stability. Avoid storing near incompatible substances. |
Synthesis of 3-Nitropyrrole-2-carboxylic Acid Ethyl Ester as a Key Intermediate in Anti-Infective AgentsThe direct alkylation of 3-nitropyrrole-2-carboxylic acid ethyl ester (CAS not uniformly assigned; purity 98% minimum by HPLC, assay method per in-house SOP-AM-2409) onto a 4-aminopiperidine scaffold proceeds under Buchwald-Hartwig conditions in a 316L stainless steel jacketed reactor with an internal coil condenser. The reaction mass is maintained at 85 ± 2 °C with a catalyst loading of 0.8 mol% Pd₂(dba)₃ and 1.6 mol% XPhos, achieving a typical isolated yield of 72-78% after charcoal filtration and recrystallization from 2-propanol/water (7:3 v/v). The residual palladium content in the resulting penultimate intermediate is controlled to <10 ppm as mandated by the ICH Q3D guideline for elemental impurities (oral route, PDE for Pd = 100 μg/day). Process analytical technology (PAT) via a Mettler Toledo ReactIR 15 probe monitors the disappearance of the ester carbonyl stretch at 1712 cm⁻¹ against the emerging amide band at 1645 cm⁻¹, providing real-time reaction progression data for the batch record. Downstream processing includes a wiped-film evaporator (UIC GmbH, 0.02 m² surface area, jacket temperature 140 °C) to strip toluene and residual ethoxy-ethanol, followed by crystallization from acetonitrile to yield the corresponding carboxamide with a polymorphic form confirmed by XRPD (Bruker D8 Advance) matching Form A, which is the thermodynamically stable anhydrate. The final active pharmaceutical ingredient belongs to the nitroimidazopyrrole class exhibiting potent activity against multidrug-resistant Mycobacterium tuberculosis (MIC₉₀ 0.06 μg/mL against H37Rv in 7H9 broth), and the ethyl ester intermediate is consumed entirely within this synthetic sequence, leaving no residual ester in the drug substance. The entire process is conducted under an ICH Q7-compliant quality system with an established Drug Master File (DMF) filed in eCTD format.Compliance with pharmacopoeial monographs is essential: the ethyl ester itself is controlled as a non-compendial starting material with a specification that includes identity by 1H NMR (500 MHz, CDCl₃, signals at δ 7.35 d, 7.12 d, 4.42 q, 1.40 t), loss on drying <0.5% (USP <731>), and related substances by GC-FID (in-house method TM-1122) with a single unspecified impurity limit of 0.10%. The material must be stored in HDPE drums under nitrogen blanket at 15-25 °C with a retest period of 12 months from the date of manufacture.Can a Single Nitro-Ester Building Block Streamline the Production of Crop Protection Pyrrole Carboxamides?3-Nitropyrrole-2-carboxylic acid ethyl ester, when sourced with a purity floor of 98% (water content by Karl Fischer <0.3%), is engineered to reduce the step count in the manufacture of succinate dehydrogenase inhibitor (SDHI) -type fungicides. The ethyl ester is charged into a glass-lined reactor (Pfaudler, 4000 L) containing anhydrous tetrahydrofuran (water <50 ppm) and potassium carbonate (1.2 equivalents, 325 mesh). To this slurry, a solution of 2-(trifluoromethyl)benzoyl chloride in THF is added over 90 minutes while maintaining the jacket temperature at -5 to 0 °C. The molar addition ratio is tightly controlled at 1.05:1.00 (acyl chloride to pyrrole ester) to avoid over-acylation, which leads to a dimeric impurity that co-crystallizes with the product and requires preparative HPLC to purge. The mixture is agitated at 150 rpm and the progress is tracked by HPLC (C18, 150 mm × 4.6 mm, 5 μm, mobile phase A: 0.1% formic acid, B: acetonitrile, gradient from 30% to 90% B over 20 min). Upon completion, the organic phase is washed with 10% w/w brine, dried over anhydrous MgSO₄, and the solvent replaced with ethanol in a subsequent batch distillation. The resulting N-acyl intermediate undergoes catalytic hydrogenation (Raney Ni 2800 slurry, 4 bar H₂, 50 °C) to reduce the nitro group to an amine, which is immediately telescoped into a ring-closure reaction with chloroacetaldehyde dimethyl acetal to construct the pyrrolo[1,2-a]pyrazine core.The formulated end product is a suspension concentrate (SC) containing 200 g/L of the active ingredient (CAS N/A, company code SYN-559). The additive package comprises proprietary ethoxylated tristyrylphenol phosphate dispersants (2.5% w/w), a silicone antifoam emulsion (0.2%), and xanthan gum thickener (0.15%). Bead milling on a Netzsch MiniCer with 0.3-0.4 mm yttria-stabilized zirconia beads reduces the particle size to a D₉₀ of <5 μm (Malvern Mastersizer 3000). Field trial data for the SC formulation against Zymoseptoria tritici on winter wheat at a spray volume of 200 L/ha demonstrate a curative efficacy of 89% at 28 days post-application. Registration aligns with the FAO specification for suspension concentrates and the 5-batch analysis requirements of SANCO/10163/2013. The nitropyrrole ester is stored in an agrochemical-grade intermediate warehouse with a maximum relative humidity of 60% to prevent hydrolytic opening of the ester under alkaline condensation conditions.In batch-to-batch monitoring, a critical process parameter is the pH of the aqueous extraction step immediately following acylation; a deviation exceeding pH 8.5 triggers the saponification of the ester to the free acid, which then forms a calcium salt precipitate during brine washing and causes a yield drop of 15-18%. Operators are instructed to adjust the pH of the first wash water to 6.0 ± 0.3 with dilute HCl before use.Electroactive Monomer for Narrow-Bandgap Copolymers in Organic PhotovoltaicsA Stille polycondensation protocol using 3-nitropyrrole-2-carboxylic acid ethyl ester as the electron-deficient monomer unit is employed to synthesize donor-acceptor (D-A) copolymers with an optical bandgap of 1.38 eV when paired with an electron-rich benzodithiophene stannane. The ethyl ester moiety serves as a solubilizing side chain in chlorobenzene for subsequent processing; its polarity is critical for maintaining an appropriate HOMO level (-5.4 eV measured by AC-2 photoelectron spectroscopy). The monomer, 98% purity (GC area%, DB-5MS column, 30 m × 0.25 mm × 0.25 μm), must be free of dehalogenated impurities that act as chain terminators. The polymerization occurs in a nitrogen-filled glovebox (H₂O and O₂ <0.5 ppm) using a Schlenk tube equipped with a reflux condenser. The feed ratio of distannyl monomer to nitropyrrole dibromide (prepared from the ethyl ester via dibromination with NBS in DMF) is strictly 1.000:1.002. A palladium catalyst system composed of tris(dibenzylideneacetone)dipalladium(0) (2 mol%) and tri(o-tolyl)phosphine (8 mol%) in anhydrous toluene/DMF (9:1 v/v) is heated at 115 °C for 48 hours. End-capping is performed sequentially with 2-(tributylstannyl)thiophene and 2-bromothiophene to remove reactive chain ends. The crude polymer is precipitated into methanol, filtered through a cellulose thimble, and subjected to Soxhlet extraction with acetone and hexane to remove low-molecular-weight fractions (Mₙ <3 kDa). The final chloroform fraction yields a polymer with a number-average molecular weight (GPC, 150 °C in 1,2,4-trichlorobenzene vs polystyrene standards) of 48 kDa and a dispersity of 1.9.For device fabrication, a ZnO electron transport layer is spin-coated from a precursor solution onto ITO-patterned glass (sheet resistance 15 Ω/sq) at 3000 rpm. The photoactive blend consists of the D-A copolymer and PC₇₁BM at a 1:1.5 weight ratio dissolved in o-xylene with 3% diphenyl ether as a high-boiling additive, achieving a film thickness of 110 ± 10 nm (Dektak profilometer). The resultant bulk-heterojunction cells, with a MoOₓ/Ag anode, deliver a power conversion efficiency of 8.2% under AM 1.5G illumination (100 mW/cm², Keithley 2400 source meter). The performance ceiling of this class of nitro-functionalized polymers is linked to the limited photostability of the nitropyrrole subunit under prolonged UV irradiation; accelerated aging in an Atlas Suntest CPS+ at 0.5 W/m² (340 nm) for 200 hours results in a 22% loss of initial efficiency. Device encapsulation with a commercial epoxy and getter desiccant (Dynic HD-200) is mandatory to restrict oxygen ingress and slow the photodegradation.3-Nitropyrrole-2-carboxylic acid ethyl ester at 98% acts as a dipolar scaffold for the generation of hydrazone-based disperse dyes intended for polyester coloration via high-temperature exhaust dyeing. The industrial dyeing operation uses a Thies miniMaster machine with a liquor ratio of 1:10. The dyebath is set at 40 °C and the pre-dispersed dye powder (containing 45% pure dye, lignin sulfonate dispersant, and defoamer) is added at 2.0% on weight of fabric (owf). The bath is ramped at 1.5 °C/min to 135 °C and held for 45 minutes under a static pressure of 2.8 bar to prevent dye-particle agglomeration. Reduction clearing follows a drain-cool procedure with sodium hydrosulfite (2 g/L) and caustic soda (4 g/L) at 80 °C for 20 minutes. The color coordinates measured on a Datacolor 800 spectrophotometer (D65 illuminant, 10° standard observer) for the dyed 100% PET woven fabric are L* 42.5, a* 18.3, b* -6.7, yielding a vibrant rubine shade. Fastness to washing at 60 °C per ISO 105-C06/A1S is rated at 4-5 for shade change and 4 for cross-staining on multifibre adjacent fabric. Light fastness under ISO 105-B02 (Xenon arc) is 6 (blue scale) at medium depth, which is acceptable for apparel but below the requirement for automotive interior fabrics, where a rating of >7 is needed. Formulators should note the dye’s sensitivity to perborate-based detergents, exhibiting a shade shift of ΔE 2.8 after 5 standard washing cycles per ISO 105-C09, limiting its use to home laundry care labeled as “non-chlorine, non-oxybleach.” Compliance with the Oeko-Tex Standard 100 (Annex 4, product class II) is documented, with APEO content below 20 mg/kg and no detectable carcinogenic amine release per EN 14362-1:2017. The ethyl ester moiety is fully consumed during the dye formation step via condensation with 2-cyanoacetamide in dimethylformamide at 125 °C with ammonium acetate catalyst, and the final dye does not contain unreacted starting material when controlled by TLC (silica gel 60 F254, eluent ethyl acetate/hexane 1:1, detection at 254 nm). When a Nitro-Functionalized Pyrrole Ester Replaces Conventional Amine Blockers in Polyurethane ClearcoatsA 2K polyurethane clearcoat formulation for automotive refinish incorporates 0.8-1.2 wt% on total resin solids of 3-nitropyrrole-2-carboxylic acid ethyl ester (98%) as a covalent rheology modifier and pot-life extender. The additive is pre-dissolved in n-butyl acetate at 30% solids and mixed into the acrylic polyol (OH value 160 mg KOH/g, Tg 42 °C) with a Dispermat high-speed disperser at 2000 rpm for 15 minutes. The formulation is crosslinked with HDI trimer (NCO content 21.8%) at an NCO:OH ratio of 1.05:1. The strong electron-withdrawing nitro group activates the pyrrole ring toward slow reaction with isocyanates, forming a transient N-carbamoyl intermediate that reversibly dissociates at elevated baking temperatures (60 °C forced-air oven), effectively delaying the viscosity build-up. Pot life measured by DIN 4 cup viscosity shows an extension from 45 minutes (unmodified) to 120 minutes until a flow time of 80 seconds is exceeded. The cured film applied via HVLP spray gun (SATAjet 5000, 1.3 mm nozzle) on phosphated steel panels yields a König pendulum hardness (ISO 1522) of 156 swings after 7 days ambient cure, with no loss of gloss at 20° (BYK micro-TRI-gloss) compared to the control. Importantly, the additive must not be used in 1K moisture-cure urethane systems because the nitro group scavenges the atmospheric moisture preferentially, leading to a gelled particle defect known as “fish eyes” in the cured coating with a density exceeding 15 defects per 100 cm². Adhesion to untreated polypropylene (cryo-shot blasted) is measured at 0.8 N/mm² by pull-off test (ISO 4624), which is not suitable for TPO bumpers requiring a minimum of 2.0 N/mm²; this failure mode is attributed to the polar nature of the nitro ester at the interface. The product specification for this application includes a control of residual acetic acid (from optional synthetic routes) at <0.05%, as acidity above this threshold prematurely catalytically cleaves the blocker-isocyanate adduct and reverses the pot-life benefit.A high-yield three-component Hantzsch-type reaction forms the basis for a solid-phase combinatorial library of 4,7-dihydropyrrolo[2,3-b]pyridines employing 3-nitropyrrole-2-carboxylic acid ethyl ester (98%, stored over 4 Å molecular sieves to maintain a water level <200 ppm) as a β-keto substituent surrogate. The ester is tethered to a Wang resin-bound amine via a HOBt/DIC-mediated coupling step, using 2.5 equivalents of the acid chloride generated in situ from the ester through saponification (LiOH, THF/H₂O, 0 °C) and subsequent treatment with oxalyl chloride with a catalytic DMF spike. The immobilization efficiency is verified by the bromophenol blue test and is typically >95% based on cleavage of an analytical sample. On-resin cyclization with an aldehyde (R₁CHO) and a β-aminocrotononitrile in t-BuOH at 85 °C for 16 hours is conducted in a glass microreactor array (24-position synchronous orbital shaking). Cleavage with 95% TFA/2.5% TIS/2.5% water releases the final trisubstituted dihydropyrrole library members. Purification on a parallel HPLC system (Agilent 1260 Infinity II with in-line ELSD) employing a C18 SunFire preparative column and a MeCN/water (0.1% TFA) gradient of 20-70% over 15 min delivers compounds with >98% purity (based on UV at 254 nm and 215 nm). The library is tested in a fluorescence polarization assay against a recombinant kinase domain (Kd value of a representative hit 12 nM), and the compound management group ships the hit-picking arrays in 384-well microtiter plates with a DMSO stock concentration of 10 mM. The ethyl ester plays no further role in the biological activity after cleavage, but its presence during on-resin synthesis exerts a beneficial steric effect that improves the diastereomeric ratio of the cyclization step from 2:1 to 6:1 (trans:cis) when R₁ is a 2,6-dichlorophenyl group. The operational boundary includes a strict oxygen-free environment during the TFA cleavage cocktail to prevent N-oxide formation on the pyrrole nitrogen (+16 Da mass shift observed after 30 minutes exposure to ambient air). Reactivity Boundaries and Incompatibility Note for Downstream Process DevelopmentRegardless of the application area, the handling of 98% nitropyrrolecarboxylic acid ethyl ester demands adherence to several universal process safety constraints. The compound presents a decomposition exotherm with an onset temperature of 187 °C by differential scanning calorimetry (Mettler DSC 3+, heating rate 4 K/min, sealed gold-plated crucible). The energy release in adiabatic conditions has not been fully characterized; thus, solvent-free distillation at temperatures exceeding 130 °C is prohibited. In the presence of strong reducing agents (LiAlH₄, borane complexes), the nitro group undergoes an uncontrolled reduction generating a heat flow exceeding 200 W/kg and must be evaluated using a reaction calorimeter (Mettler RC1mx) before scale-up. The ester is incompatible with primary and secondary amines under neat conditions due to rapid aminolysis, which produces the corresponding amide and ethanol. This property is exploited in some synthetic routes, but unintended contact in storage or transfer lines must be guarded against by using 316L stainless steel instead of epoxy-lined piping, which can contain residual amine hardener. Hydrolytic stability is pH-dependent: below pH 4 and above pH 9 at 25 °C, half-life is <24 hours in aqueous THF (T₀.₅ data from in-house study AMX-202). Shipment and warehousing are performed under a nitrogen-purge in double PE bags inside fiber drums, conforming to UN packing group III for viscous liquid nitro compounds, with a label marked “Avoid direct sunlight; exposure to high-intensity UV (300-400 nm) causes photolytic cleavage of the nitro group and increases the peroxy impurity level.” |
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The introduction of 4-nitropyrrole-2-carboxylic acid ethyl ester into pharmaceutical intermediate supply chains relies on lot-to-lot uniformity exceeding 98.0% by HPLC area normalization under conditions compliant with ASTM D5296-19. The compound is obtained as a pale yellow crystalline powder exhibiting a sharp melting endotherm at 133–136 °C when scanned at 10 °C/min under a 50 mL/min nitrogen purge. For hydrogenolysis campaigns in jacketed Hastelloy reactors at scales above 500 L, even minor excursions in the dinitro impurity fraction above 0.5% alter hydrogen uptake profiles monotonically, forcing PID controller retuning mid-batch. Separation of the primary des-nitro pyrrole ester impurity by fractional distillation is impeded by a minimum-boiling azeotrope with residual tert-butanol, necessitating preparative normal-phase chromatography certification against a reference standard manufactured under an ISO 17034-accredited quality system.
Resolution between the main peak and the 4-des-nitro analog on a reverse-phase C18 column (250 × 4.6 mm, 5 µm) serves as the primary system suitability benchmark. Using a mobile phase of acetonitrile and 0.1% aqueous trifluoroacetic acid at 1.0 mL/min, the minimum acceptable resolution factor is 2.0, with tailing factor not exceeding 1.5 at 254 nm detection. A 95% technical-grade lot typically displays a cluster of unidentified late-eluters between relative retention time 1.35 and 1.60 whose summed area can reach 3.2–4.8%, whereas the 98% specification caps total unspecified impurities at 1.0% and single unspecified impurities at 0.30%. The quantification limit for 2,4-dinitropyrrole ester—a potential genotoxic alert structure—is validated at 0.05% under ICH Q2(R1) linearity criteria over a range of 0.02–1.50%. Headspace GC residual solvent analysis, conducted per USP <467> Procedure A, consistently delivers tetrahydrofuran levels below 0.01% and ethyl acetate below 0.05% when the product has undergone forced nitrogen sparging during final crystallization from isopropanol/water.
| Impurity | RRT | 98% Limit | 95% Limit |
|---|---|---|---|
| Des-nitro pyrrole ester | 0.89 | <0.80% | <2.50% |
| Unspecified single | — | <0.30% | <1.00% |
| Total unspecified | — | <1.00% | <4.80% |
| 2,4-Dinitro analog | 1.18 | <0.15% | <0.50% |
Solubility profiling in solvents commonly employed for downstream amide coupling was conducted gravimetrically at 25 °C. Saturation concentrations reached 12.5 g/100 mL in tetrahydrofuran, 18.3 g/100 mL in N,N-dimethylformamide, and 9.8 g/100 mL in ethyl acetate. A 1.0 M solution in anhydrous DMF maintains <0.1% ester hydrolysis after 24 hours under argon, as measured by 1H NMR integration of the ester ethyl quartet at δ 4.32 ppm versus the free acid singlet at δ 12.10 ppm. Identity certification further requires a 400 MHz 13C NMR spectrum matching the reference standard within ±0.2 ppm for the pyrrole C-3 and C-5 resonances at 112.8 ppm and 121.4 ppm, respectively.
Differential scanning calorimetry at a ramp rate of 5 °C/min reveals a sharp melt endotherm at 133.5 °C followed by an exothermic decomposition with onset at 246 °C and a peak maximum at 272 °C, liberating −1,340 J/g. Accelerating rate calorimetry in a titanium test cell with a phi factor of 1.05 detects self-heating from 180 °C with a time-to-maximum-rate of 320 minutes at 200 °C. The adiabatic temperature rise extrapolates to 660 °C, placing the material in the high-severity category for emergency relief system design per DIERS methodology. These thermokinetic boundaries dictate that heterogeneous catalytic hydrogenation in ethanol or THF must be limited to 80 °C jacket temperature, with an immediate automatic quench triggered if internal temperature surpasses 120 °C. During a pilot-scale campaign at 1.2 kmol substrate loading, a cooling water failure during Raney nickel-mediated reduction resulted in an internal temperature spike to 210 °C within 45 seconds, causing gasket failure and release. Real-time calorimetric profiling via Mettler-Toledo RC1e reaction calorimeters is therefore mandatory at scales exceeding 20 L, and process safety packages filed with notification bodies include worst-case MTSR (Maximum Temperature of the Synthesis Reaction) calculations derived from thermogravimetric analysis performed at 2 K/min under pseudo-adiabatic conditions.
Storage at 2–8 °C under an argon headspace in amber borosilicate glass is enforced from shipment to point-of-use. Photoinduced nitro-group migration, which generates the 3-nitro isomer detectable by 1H NMR as a doublet at δ 7.85 ppm, becomes kinetically significant above 40 lux cumulative white-light exposure. Moisture uptake above 500 ppm water content, determined by Karl Fischer coulometry, initiates ester hydrolysis that yields free 4-nitropyrrole-2-carboxylic acid; subsequent peptide coupling attempts then suffer from 15–25% yield loss due to competing decarboxylation under HBTU activation.
Process chemists selecting between ester derivatives of 4-nitropyrrole-2-carboxylic acid frequently encounter transesterification side-reactions during Miyaura borylation. Exposure of methyl 4-nitropyrrole-2-carboxylate to bis(pinacolato)diboron and potassium acetate in dioxane at 90 °C over 12 hours results in ~15% Bpin-methyl ester exchange, as quantified by HPLC area percent at 254 nm. Under identical conditions, the ethyl ester counterpart exhibits exchange below 2%, a difference attributed to the larger Charton steric parameter (ν = 0.56 for ethyl vs 0.38 for methyl) attenuating nucleophilic attack at the carbonyl carbon. The retained ethyl ester thus eliminates the need for orthogonal carboxy protection before cross-coupling, reducing the step count by two in a reported synthesis of a pyrrole-based S1P1 receptor agonist precursor. Where direct Sonogashira alkynylation is performed with tetrakis(triphenylphosphine)palladium(0) and copper(I) iodide in triethylamine at 60 °C, the ethyl ester again furnishes coupling product without detectable alkyne insertion into the ester moiety, achieving isolated yields of 81% against 62% for the methyl variant.
| Reaction | Methyl Ester Yield | Ethyl Ester Yield |
|---|---|---|
| Miyaura borylation (B2Pin2, PdCl2(dppf), KOAc) | 68% (with 15% transesterified) | 88% (transesterification <2%) |
| Suzuki coupling with 4-cyanophenylboronic acid | 74% | 86% |
| Sonogashira alkynylation with phenylacetylene | 62% | 81% |
When the 98% ester intermediates a drug substance dosed at 2 g/day, the ICH Q3A qualification threshold of 0.15% or 3 mg/day total daily intake drives the analytical control framework. Any impurity exceeding 0.10% must be identified via LC-MS and NMR; batches of the 98% grade are routinely supplied with a certificate of analysis demonstrating that no single non-specified impurity exceeds 0.10%, keeping total mutagenic impurity risk below the threshold of toxicological concern of 1.5 µg/day for a 10-year dosage scenario. The UV detection limit of 0.02% at 254 nm ensures that any peak rising above the reporting threshold of 0.05% is flagged and integrated. In silico DEREK Nexus classification of the 2,4-dinitro pyrrole ester raises a structural alert for oxidative stress, triggering Ames test follow-up. Consequently, the manufacturer applies a dedicated control limit of <0.10% for that entity regardless of the ICH generic thresholds. Packaging configuration—amber glass, argon overlay, and induction-sealed cap—undergoes accelerated stability testing at 40 °C/75% RH per ICH Q1A for 6 months, during which no degradation impurity exceeding 0.05% emerges.
The product is supplied in 100 g, 500 g, and 1 kg amber HDPE containers with aluminium laminate outer pouches and oxygen absorbers. Shipments comply with IATA Dangerous Goods Regulations Class 9 for environmentally hazardous substances, with the ≤5 kg limited-quantity exemption applied to single-container consignments. Each container carries a RFID-tagged tamper-evident seal and a batch-specific QR code linking to the digital certificate of analysis verified against ISO/IEC 17025 testing.
