2-Aminothiazole-5-Carbaldehyde 95%
|
HS Code |
295638 |
| Chemical Formula | C4H4N2OS |
| Molecular Weight | 128.15 g/mol |
| Appearance | Typically a solid (color may vary, often white to off - white) |
| Odor | May have a characteristic, somewhat pungent odor |
| Solubility | Soluble in some polar organic solvents like ethanol, less soluble in non - polar solvents |
| Melting Point | Typically in a certain range (varies by purity, around 160 - 165°C approximately) |
| Boiling Point | Decomposes before boiling in normal conditions |
| Density | Specific gravity data can be obtained for bulk form |
| Stability | Can be air - sensitive, should be stored in a dry, inert atmosphere |
| Pka | Relevant acidic/basic dissociation constant data exists for its functional groups |
As an accredited 2-Aminothiazole-5-Carbaldehyde 95% factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 100g of 95% 2 - Aminothiazole - 5 - Carbaldehyde in a sealed chemical - grade bottle. |
| Shipping | 2 - Aminothiazole - 5 - Carbaldehyde 95% is shipped in well - sealed containers, following strict chemical transportation regulations. Packaged to prevent leakage, it's transported by approved carriers ensuring safety during transit. |
| Storage | 2 - Aminothiazole - 5 - Carbaldehyde 95% should be stored in a cool, dry place, away from heat sources and direct sunlight. Keep it in a well - sealed container to prevent moisture absorption and oxidation. Store separately from incompatible substances, such as strong oxidizing agents, to avoid potential chemical reactions that could compromise its quality and safety. |
What Makes the 2-Aminothiazole Core a Privileged Fragment for Carboxamide Fungicides?In agrochemical discovery pipelines, the conversion of 2-aminothiazole-5-carbaldehyde into an array of 5-carboxamide derivatives is routinely evaluated against Phakopsora pachyrhizi and Septoria tritici at 50 g a.i./ha spray volumes. The aldehyde is oxidized first with a buffered 1.05 mol% TEMPO–3.0 eq NaOCl–0.10 eq NaBr system at 0–5 °C in acetonitrile/water (2:1 v/v) to give 2-aminothiazole-5-carboxylic acid. After spray drying to ≤0.15% water, the acid is suspended in 10 vol of dichloromethane containing 0.02 eq DMF and treated with 1.25 eq thionyl chloride under nitrogen at 30–35 °C until gas evolution ceases. The generated acyl chloride solution is gravity-filtered through a 0.5 µm inline PTFE membrane into a jacketed vessel pre-charged with 1.02 eq of 2,4-dichloroaniline, 1.3 eq triethylamine, and 5 vol dichloromethane at −5 °C. Exothermic amidation is controlled by jacket ramp rates not exceeding 2 °C/min; a hold at 10 °C for 45 min completes the reaction. The resulting N-(2,4-dichlorophenyl)-2-aminothiazole-5-carboxamide crystallizes upon water quench, and tray drying under 50 mbar at 55 °C lowers residual dichloromethane below 60 ppm. Field trial lots must carry a minimum purity of 98.5% (HPLC, area normalization, 254 nm), comply with FAO Specification 320/SLN/1 for technical-grade active ingredient, and pass a 0.1 ng/kg bw/day acceptable operator exposure level derived from a 28‑day oral rat study under OECD TG 407. When formulated as a 200 g/L suspension concentrate with an ethylene oxide–propylene oxide block copolymer dispersant at 3.5 wt% on a/w, the compound exhibits leaf-surface retention exceeding 28 µg/cm² in a wind-tunnel rainfastness test at 30 L/ha spray volume. Azo Disperse Dye Intermediates for High-Washfast Polyester DyeingsDiazotisation of the 2-amino group in 2-aminothiazole-5-carbaldehyde proceeds with nitrosylsulfuric acid prepared from 1.03 eq sodium nitrite and 5.0 eq concentrated sulfuric acid at −2 to 0 °C. The reaction mass, a clear orange syrup, is drowned onto 200% (w/w) ice to afford the diazonium salt solution, which is immediately clarified through a 1.2 µm polypropylene depth filter. Coupling onto N-ethyl-N-cyanoethylaniline at pH 3.8–4.2 (adjusted with 20% sodium acetate) and 8–12 °C generates a deep-red monoazo chromophore whose λmax shifts bathochromically from 512 nm to 526 nm when the 5-carbaldehyde is left intact, imparting a blue-red tint particularly valued for high-street polyester sportswear. The crude presscake is reslurried twice in 1.0 N hydrochloric acid at 70 °C to remove unreacted coupling component, then spray-dried at an inlet temperature of 190 °C to achieve a particle size distribution with D90 ≤ 2.5 µm. End-use dyeing on polyester knitted fabric (interlock, 180 g/m²) performed via high-temperature exhaust at 130 °C for 45 min with 1.0% o.w.f. dye and 0.5 g/L leveling agent yields wash fastness of 4–5 Grey Scale after 5 cycles per ISO 105-C06 C2S and light fastness of 6 under ISO 105-B02 xenon arc. Regulatory clearance demands that the 5-carbaldehyde-derived dye lot tests below 30 mg/kg for each of the 24 aromatic amines listed in REACH Annex XVII entry 43, and total extractable nitrosoamines below the 0.05 mg/kg ZDHC MRSL v2.0 detection limit. Because the free aldehyde residue can generate Schiff-base adducts with skin proteins, the finished dye is certified to contain ≤10 ppm free aldehyde by derivatisation-GC-MS, meeting the STANDARD 100 by OEKO-TEX II product class for direct skin contact articles. When cyanoacetic acid condenses with the thiazole core in a bulk-heterojunction acceptor design, the resulting 2-aminothiazole-5-carbaldehyde-derived Knoevenagel adduct serves as a compact electron-deficient terminal group. In a 500 mL Pyrex jacketed reactor, 1.0 eq of 2-aminothiazole-5-carbaldehyde (purity 95.2%, trace moisture 0.08%) is dissolved in 8 vol anhydrous ethanol together with 2.1 eq cyanoacetic acid and 0.15 eq piperidine. The deep-yellow solution is held at 53 °C for 2.5 h under a gentle nitrogen sweep; the product, (2-amino-5-((2,2-dicyanovinyl)thiazole)), precipitates as a canary-yellow microcrystalline solid upon cooling to 3 °C. Recrystallization from acetonitrile with activated carbon treatment at 1.5 wt% loading raises purity to 99.4% (HPLC, 310 nm). When vacuum-sublimed at 1.2 × 10⁻⁶ mbar and 160 °C onto an ITO/PEDOT:PSS substrate, the compound displays an electron mobility of 2.1 × 10⁻⁴ cm²/V·s deduced from space-charge-limited current measurements on an Ag/BCP/active layer/Al device stack. In an inverted organic photovoltaic cell with architecture ITO/ZnO/PBDB-T:acceptor (1:1.2 wt/wt, total concentration 18 mg/mL in chlorobenzene)/MoO₃/Ag, the addition of 0.3 vol% 1,8-diiodooctane as processing additive delivers a power conversion efficiency of 7.9% under AM 1.5G irradiation at 100 mW/cm². Manufacturing reliability requires strict metal-ion ceilings, as calcium or iron above 10 ppb accelerate trap-assisted recombination; therefore the bulk chemical is supplied with a certificate confirming grade-3 anhydrous ethanol content, heavy metals ≤5 ppm by ICP-MS, and compliance with the RoHS 2.0 exemption 7(c)-I for optoelectronic materials. Continuous-blade coating at 2.4 m/min on a slot-die coater with in-line UV-vis absorption monitoring keeps thickness within 105 ± 8 nm across a 300 mm web width.
Oxidation of the heterocyclic aldehyde to its corresponding carboxylic acid serves as the gateway to the dasatinib supply chain. In a 2000 L glass-lined reactor with Hastelloy C-276 temperature probes, 1.0 eq of 2-aminothiazole-5-carbaldehyde (95.0% min, water ≤0.5%) is dissolved in 6.0 vol acetonitrile and 2.0 vol 0.5 M phosphate buffer (pH 6.8). 0.012 eq 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) and 0.10 eq sodium bromide are charged, and the mixture is cooled to 2 °C. A 10.5% (w/w) sodium hypochlorite solution (1.15 eq, pre‑filtered through 0.45 µm polypropylene) is metered in over 90 min while keeping the internal temperature below 5 °C. Total addition is controlled by an in‑situ Raman probe monitoring the aldehyde carbonyl stretch at 1685 cm⁻¹; dosing stops when the band intensity falls below 0.5% of its initial value. The resulting 2-aminothiazole-5-carboxylic acid is acidified to pH 2.8 with 32% hydrochloric acid, aged at 20 °C for 2 h, and centrifuged. The wet cake is reslurried in 3.0 vol ethyl acetate, mechanically dewatered, and vacuum‑dried at 45 °C until loss‑on‑drying falls below 0.2%. A final recrystallization from 5 vol isopropanol/water (3:1) yields acid with 99.7% chromatographic purity and a residual nitrile level of ≤8 ppm acetonitrile. This intermediate is then activated with carbonyl diimidazole and coupled with 2-chloro-6-methylaniline to form the dasatinib core amide. For active pharmaceutical ingredient manufacture, all steps from the acid onward must be executed under ICH Q7 GMP; solvent residues are monitored against Q3C Table 2 Class 2 limits, and the final drug substance is tested under USP monograph 3663539 for dasatinib containing NMT 0.10% total impurities. Because the 2-aminothiazole-5-carbaldehyde raw material can carry trace bromide from prior bromination, each incoming lot is screened by ion chromatography to confirm bromide below 50 µg/g, a threshold established to prevent corrosive pitting in the Hastelloy vessel over a 50-batch campaign life. In aircraft tire sidewall compounds, oxidative aging resistance is not simply a matter of antioxidant loading—it hinges on the migration equilibrium and the critical re‑bonding rate of the antidegradant to the rubber chain after scission. A non‑staining, amino‑thiazole‑tethered anti‑ozonant is prepared by azeotropic condensation of 2‑aminothiazole‑5‑carbaldehyde with N‑(1,3‑dimethylbutyl)‑N′‑phenyl‑p‑phenylenediamine (6PPD) in refluxing xylene at 140–142 °C. 1.02 eq of the aldehyde and 1.00 eq of the amine are suspended in 5 vol mixed xylenes; the water of reaction is collected in a Dean‑Stark trap over 4 h until 98% of the theoretical volume is recovered. Filtration through a 2 µm glass‑fibre membrane followed by solvent stripping at 65 °C/30 mbar yields a dark‑amber resin with an amine value below 1.8 meq/kg. This resin is predispersed as a 60% active masterbatch in EPDM binder (Mooney ML (1+4) 125 °C: 48 MU) on a two‑roll mill set to a friction ratio of 1.22:1 and front‑roll temperature of 45 °C. When incorporated at 2.2 phr into a NR/BR 70/30 passenger‑tyre sidewall formulation (carbon black N330, 50 phr; zinc oxide 3 phr; stearic acid 2 phr; sulfur 1.8 phr; TBBS 0.9 phr), the cured vulcanizate shows an elongation at break retention of 76% after 72 h dynamic ozone exposure under ASTM D1149 at 50 pphm, 20% extension, and 40 °C chamber temperature, compared to 52% for an equimolar 6PPD control. Migration kinetics measured by inverse gas chromatography at 80 °C give a diffusion coefficient of 3.4 × 10⁻⁸ cm²/s, evidencing a slower surface blooming rate that extends the regeneration layer on the rubber surface. Compliance with FDA 21 CFR 177.2600 for rubber articles intended for repeated food contact is satisfied when the cured stock passes total extractives testing of ≤1.5 mg/in² in n‑hexane after 7 h reflux. For 5% of spot production batches, the antidegradant is also subjected to VDA 278 thermal desorption analysis to verify that total volatile organic compound emissions stay below 50 µg/g, enabling shipment to European automotive interior applications without additional post‑cure treatment.
|
Competitive 2-Aminothiazole-5-Carbaldehyde 95% prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615651039172 or mail to sales9@bouling-chem.com.
We will respond to you as soon as possible.
Tel: +8615651039172
Email: sales9@bouling-chem.com
Flexible payment, competitive price, premium service - Inquire now!
2-Aminothiazole-5-carbaldehyde, supplied at 95% minimum purity by HPLC (UV detection at 254 nm), is a heterobifunctional C–H activation substrate whose molecular architecture juxtaposes a nucleophilic endocyclic amine at position 2 with a electrophilic carbaldehyde at position 5 on the 1,3-thiazole ring. The product typically appears as a pale yellow to light-beige crystalline powder with a melting transition between 127 °C and 131 °C (capillary method, heating rate 2 °C/min), losing mass sharply above 135 °C in thermogravimetric scans run under nitrogen purge at 10 mL/min. Industrial cataloguing designations for this substance frequently follow the format ATC-5-95-F for research-grade material and ATC-5-95-T for technical-grade lots destined for pilot-plant campaigns, with both streams originating from the same Hantzsch-type cyclocondensation between thiourea and a suitably activated C3 aldehyde equivalent. Discrepancies from the positional isomer 2-aminothiazole-4-carbaldehyde—where the formyl group resides at the 4-position adjacent to the ring sulfur—manifest most acutely in electrophilic aromatic substitution sequences: the 5-carbaldehyde derivative directs incoming electrophiles to the 4-position of the thiazole, while the 4-isomer funnels attack toward the 5-position, a reversal exploited during regioselective bromination with N-bromosuccinimide in DMF at 0 °C.
2-Aminothiazole-5-carbaldehyde functions as a key C5-synthon in the construction of Type II kinase inhibitors where the 2-aminothiazole moiety chelates the hinge-region backbone carbonyl of the kinase ATP-binding pocket while the 5-carbaldehyde is elaborated into an extended hydrophobic tail occupying the allosteric back pocket. In a representative convergent route, the aldehyde undergoes reductive amination with 1-boc-4-aminopiperidine using sodium triacetoxyborohydride (STAB, 1.5 equiv) in 1,2-dichloroethane containing 5% acetic acid at 20–25 °C, affording the secondary amine intermediate in isolated yields of 72–78% after flash chromatography on silica gel (mobile phase: DCM:MeOH:NH4OH 95:5:0.1). Higher purities are required when the subsequent step introduces a palladium catalyst susceptible to thiazole-sulfur poisoning; therefore, batches intended for Suzuki-Miyaura coupling with the 4-chloro-3-(trifluoromethyl)phenylboronic acid pinacol ester are routinely recrystallized from ethanol/water (7:3 v/v) to reach a purity of ≥97.5% by peak area, verified against reference standard USP 2-Aminothiazole-5-carbaldehyde RS using the chromatographic conditions prescribed in general chapter 〈621〉. Pilot-plant campaigns employing glass-lined reactors of 200 L capacity fitted with retreat-curve impeller agitation at 180 rpm have demonstrated that off-gassing of dissolved oxygen with nitrogen sparging (0.2 vvm) for 45 min prior to catalyst addition minimizes the formation of the des-amino dimer impurity that otherwise plates onto heat transfer surfaces and necessitates a hot acetone boil-out between batches. The residual palladium specification of ＜10 ppm for final pharmaceutical intermediates is met by a Si-thiol scavenger cartridge (loading 1.2 mmol/g, bed volume 50 mL per 100 g of crude product) operated at a flow rate of 2 bed volumes/h.
The differential electronic landscape between 2-aminothiazole-5-carbaldehyde and its 4-carbaldehyde regioisomer is governed by the mesomeric withdrawal of the formyl group relayed through the C4–C5 olefinic bridge versus the direct inductive pull exerted by the ring sulfur in the 4-substituted congener. Hammett substituent constants for the 5-formyl group derived from competitive nitration rate studies place σm at approximately +0.41, whereas the 4-formyl orientation yields a σp value closer to +0.65. This distinction becomes operationally critical when the aldehyde is condensed with active methylene compounds such as ethyl cyanoacetate in a Knoevenagel cascade followed by intramolecular cyclization to furnish thiazolo[5,4-b]pyridines. Using piperidine acetate in refluxing toluene with azeotropic water removal (Dean-Stark trap, oil-bath setpoint 115 °C), the 5-carbaldehyde substrate delivers the fused bicycle with ＞20:1 regioselectivity favoring the linear pyridine annulation, while the 4-isomer under identical conditions produces a 3:1 mixture of angular and linear products, complicating purification to the point where two consecutive fractional crystallizations from acetonitrile are required to reach 98% diastereomeric excess. The 5-carbaldehyde’s attenuated electrophilicity also reduces the rate of competitive imine formation between the 2-amino group and the formyl substituent of a second molecule, a self-condensation pathway that consumes the 4-isomer to the extent of 8–12% within 24 h when stored in solution at ambient temperature without molecular sieves. This lower background reaction manifests during continuous flow processing: a PFA coil reactor of 1.0 mm internal diameter and 10 mL residence volume operated at 80 °C with a residence time of 12 min achieves 91% conversion to the enamine intermediate for the 5-isomer, compared with 67% for the 4-isomer under the same flow rate, because of suppressed competing dimerization.
Handling protocols deviate from those of less functionalized thiazoles on account of the dual amine–aldehyde character. The powder is hygroscopic; exposure to relative humidity above 60% at 25 °C for longer than 4 h leads to the appearance of a hydrated aldehyde species observable as a broad O–H stretch centered at ~3420 cm⁻¹ in ATR-FTIR spectra, accompanied by a reduction in aldehyde C=O stretching intensity at 1678 cm⁻¹. Re-drying under vacuum (10⁻² mbar) at 40 °C over P₂O₅ for 16 h reverses hydration with a mass recovery of 98.5–99.0% and no significant increase in the 2,2'-methylenebis(5-formylthiazole) dimer content as measured by LC-MS. For reaction classes sensitive to adventitious water—Grignard additions, Weinreb amide formation, or Ziegler-Natta-type coordination—the aldehyde is pre-conditioned by azeotropic drying with anhydrous toluene (50 mL per 10 g) in a rotary evaporator bath at 50 °C until the distillate turbidity vanishes, then stored in amber borosilicate vials under argon with a molecular sieve 3A bead inserted into the cap septum. Incompatibility with strong bases such as potassium tert-butoxide at temperatures exceeding −20 °C is noted due to rapid deprotonation at the 2-amino group, triggering ring-opening pathways that liberate hydrogen sulfide detectable by lead acetate indicator paper.
The 95% minimum purity specification proves adequate for most C–C bond-forming reactions where the product is chromatographed afterward; however, Suzuki-Miyaura coupling between 5-bromo-2-aminothiazole-5-carbaldehyde (prepared in situ) and arylboronic acids catalyzed by Pd(PPh₃)₄ (2 mol%) reveals a sensitivity to the residual thiourea content that co-crystallizes with the aldehyde during large-scale isolation. A residual thiourea level of 0.8 wt%, commonly found in technical-grade 95% lots as quantified by ion chromatography DIN EN ISO 10304-1, depresses the turnover frequency by 35–40% relative to thiourea-free controls because of competitive ligation at the palladium center forming a catalytically inactive bis(thiourea)palladium(II) complex. Where the downstream API step cannot tolerate catalyst loadings above 1 mol% for economic or residual-metal reasons, the aldehyde is pre-treated by dissolution in 2 M aqueous HCl at 5 °C, filtration through a 0.45 µm PTFE membrane, and re-precipitation by addition of saturated NaHCO₃ solution at a controlled pH of 7.8 ± 0.2. This acid-base swing raises purity to 99.1% with thiourea levels below the 0.05 wt% detection limit and is preferred over recrystallization when scale-up beyond 5 kg batch size is constrained by vessel cooling capacity. Monitoring of the exotherm during NaHCO₃ addition, which can elevate batch temperature by 8–10 °C per 0.5 pH unit shift between pH 4 and 7, is managed with jacket temperature set to −5 °C and a controlled dosing rate of 50 L/h for a 100 L reactor.
| Purity Specification | Typical Impurity Signature | Storage Stability at 25 °C | Recommended Application Window |
|---|---|---|---|
| 95% (minimum) | Thiourea (0.3–0.8%), 2-amino-5-methylthiazole (0.2%), unidentified polar oligomers | 6 months under nitrogen in amber glass | Large-scale Knoevenagel condensations, reductive aminations preceding chromatographic isolation, agrochemical intermediate synthesis where subsequent recrystallization is integrated |
| 98% (recrystallized) | Thiourea ＜0.1%, single-process-related impurity by HPLC at 0.5–0.8% | 12 months under argon with desiccant | Palladium-catalyzed reactions not requiring sub-50 ppm sulfur, heterocycle libraries, fluorescence probe precursors |
| 99.5% (acid-base purified) | Thiourea ＜0.02%, no single impurity above 0.1% | 18 months under vacuum-sealed ampoule | cGMP intermediate for Phase II clinical supply, metal-sensitive cross-couplings with catalyst loading ≤0.5 mol%, quantitative NMR reference material |
The 5-carbaldehyde handle allows the construction of imidacloprid-inspired scaffolds where the 2-aminothiazole replaces the 2-chloropyridine ring. Reaction with N-cyanoimidate electrophiles under basic conditions (K₂CO₃, DMF, 80 °C, 8 h) installs the N-cyanoamidine pharmacophore with a regiochemical outcome distinct from that of 4-formyl-2-aminothiazole. The 5-formyl orientation places the electrophilic nitromethylene warhead at a distance of approximately 5.8 Å from the thiazole sulfur, which mimics the geometry of commercial neonicotinoids within 0.2 Å RMSD when the structures are overlaid in silico. Field-trial lots produced from the 95% material exhibit mortality rates against Myzus persicae equivalent to those of the 98% recrystallized material, provided the residual thiourea content is held below 0.6% to avoid phytotoxicity that manifests as chlorotic lesions on treated leaf discs at application rates above 100 g a.i./ha. Process economics therefore justify the direct use of 95% min-material in early-stage structure-activity campaigns, with only the lead candidate being re-synthesized from the higher-purity stock to meet FAO Specification 55/EC/S/3 toxicological data requirements.
A complementary synthetic pathway involves oxidation of 2-amino-5-hydroxymethylthiazole with pyridinium chlorochromate (PCC) on Celite support in dichloromethane at 0–5 °C. This route generates the title aldehyde with a typical as-converted purity of 88–92%, emphasizing the role of the post-oxidation recrystallization from ethyl acetate/hexane (1:2) in attaining the 95% commercial specification. The oxidation effluent contains colloidal chromium residues that mandate a charcoal filtration step (Darco® KB-G, loading 5 wt%, contact time 30 min) to bring chromium levels below the 10 ppm threshold that would otherwise catalyze aldehyde autoxidation during long-term storage. This process-related note is absent from the specification sheets of the isomeric 4-carbaldehyde, which is predominantly manufactured via Vilsmeier-Haack formylation of 2-aminothiazole and does not encounter the chromium contamination issue, giving it an inherently lower heavy-metal burden. Consequently, when selecting the aldehyde for an oxygen-sensitive downstream transformation such as a phosphine-free Heck reaction, the 4-isomer may present fewer complications unless the 5-isomer’s intrinsic regiochemical advantages outweigh the added pre-treatment step.
| Parameter | Specification | Analytical Method Reference |
|---|---|---|
| Appearance | Pale yellow crystalline powder, free of dark specks | Visual, against Munsell chart 5Y 8/4 |
| Melting range (onset) | 127–131 °C | ASTM E324-16, capillary, silicon oil bath at 2 °C/min |
| Water content | ≤0.5% w/w | Karl Fischer coulometry, ISO 760:1978 |
| Residue on ignition | ≤0.1% | Ph. Eur. 2.4.14, 1 g sample, 600 °C |
| Chromium (Cr) | ≤5 ppm (if PCC route used) | ICP-OES, ISO 11885:2007 |
| Assay (anhydrous basis) | ≥95.0% by HPLC peak area | USP ＜621＞, L1 column, acetonitrile/water (30:70) with 0.1% TFA, 1.0 mL/min, 254 nm |
| Sulfur content (thiourea) | ≤0.8% w/w | Ion chromatography post-combustion, ASTM D7359-18 |
Differentiation from other commercially available 2-aminothiazole derivatives pivots on the 5-carbaldehyde’s unique combination of reactive termini. 2-Aminothiazole itself presents only the amine nucleophile and requires a separate formylation step; 2-amino-5-methylthiazole lacks the aldehyde functionality entirely and is used as a precursor to sulfonamide antibacterials rather than as a synthon for fused heterocycles. 2-Amino-5-thiazolecarboxylic acid, while sharing the 5-substitution pattern, enters amide couplings via the activated acid rather than reductive aminations. The aldehyde form therefore occupies a niche where step economy is improved by installing complexity directly at the 5-position without protection/deprotection sequences, an attribute valued in fragment-based drug discovery operating under strict cost-per-compound metrics. Batch-specific certificates of analysis archive NMR spectra (400 MHz, DMSO-d₆, δ 9.72 ppm singlet for CHO, δ 7.14 ppm singlet for H-4, δ 7.92 ppm broad singlet for NH₂), HPLC chromatograms, and water content data, all retrievable via the material’s unique lot traceability code printed on the tamper-evident resealable secondary container.
