Skip to content

Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,252products

1,516in stock

COA + SDSwith every lot

Reference Standard

Asenapine Deschloro Impurity

Asenapine Deschloro Impurity

CAS: 1449581-59-2
Formula: C₁₇H₁₅NO₂
MW: 265.31 g/mol

In stock

Reference Standard

Asenapine Impurity 1 chemical structure

Asenapine Impurity 1

CAS: 129385-59-7
Formula: C₁₇H₁₄ClNO₂
MW: 299.7 g/mol

VQ-004446

Reference Standard

Asenapine Impurity 9 chemical structure

Asenapine Impurity 9

CAS: 1180843-76-8
Formula: C₁₈H₁₈ClNO₄
MW: 347.8 g/mol

VQ-029226

Reference Standard

Asenapine Lactam Impurity chemical structure

Asenapine Lactam Impurity

CAS: 934996-79-9
Formula: C₁₇H₁₂ClNO₂
MW: 297.7 g/mol

VQ-004447

Reference Standard

Asenapine Pyrrolidine-2,4-dione Impurity chemical structure

Asenapine Pyrrolidine-2,4-dione Impurity

CAS: 1162120-35-5
Formula: C₁₇H₁₄ClNO₃
MW: 315.7 g/mol

VQ-029227

Reference Standard

Asenapine Tetradehydro Impurity chemical structure

Asenapine Tetradehydro Impurity

CAS: 129385-60-0
Formula: C₁₇H₁₂ClNO
MW: 281.7 g/mol

In stock

Reference Standard

Asp-5-Oxytocin chemical structure

CAS: 65907-78-0
Formula: C₄₃H₆₅N₁₁O₁₃S₂
MW: 1008.2 g/mol

VQ-027344

Reference Standard

Asp7 Linaclotide Impurity chemical structure

Asp7 Linaclotide Impurity

CAS: 1207977-38-5
Formula: C₅₉H₇₈N₁₄O₂₂S₆
MW: 1527.7 g/mol

VQ-038043

Reference Standard

Aspartic Acid - Impurity A (Ammonium Salt) chemical structure

Aspartic Acid - Impurity A (Ammonium Salt)

CAS: 20261-05-6
Formula: C₄H₁₂N₂O₅
MW: 168.15 g/mol

VQ-051025

Reference Standard

Aspartic Acid - Impurity C (Magnesium Salt Hydrobromide) chemical structure

Aspartic Acid - Impurity C (Magnesium Salt Hydrobromide)

CAS: 53459-38-4
Formula: C₅H₈BrMgNO₄
MW: 250.33 g/mol

VQ-048754

Reference Standard

Aspirin Impurity F chemical structure

Aspirin Impurity F

CAS: 1466-82-6
Formula: C₁₈H₁₄O₇
MW: 342.3 g/mol

VQ-021418

Reference Standard

Asunaprevir chemical structure

CAS: 630420-16-5
Formula: C₃₅H₄₆ClN₅O₉S
MW: 748.3 g/mol

VQ-045243

Reference Standard

Atazanavir Amine Analog chemical structure

Atazanavir Amine Analog

CAS: 1028634-76-5
Formula: C₃₆H₅₀N₆O₅
MW: 646.8 g/mol

VQ-024382

Reference Standard

Atazanavir Diol Impurity

Atazanavir Diol Impurity

CAS: 73488-74-1
Formula: C₁₅H₂₃NO₄
MW: 281.35 g/mol

VQ-035815

Reference Standard

Atazanavir Hydrazine Analog chemical structure

Atazanavir Hydrazine Analog

CAS: 437713-06-9
Formula: C₂₂H₂₆N₄O
MW: 362.5 g/mol

VQ-024380

Reference Standard

Atazanavir Impurity 12 chemical structure

Atazanavir Impurity 12

CAS: 198904-84-6
Formula: C₁₇H₁₉N₃O₂
MW: 297.35 g/mol

VQ-035810

Reference Standard

Atazanavir Impurity 16 chemical structure

Atazanavir Impurity 16

CAS: 2131010-71-2
Formula: C₄₆H₆₅N₇O₁₀
MW: 876 g/mol

VQ-035812

Reference Standard

Atazanavir KSM- 2 R,R Isomer chemical structure

Atazanavir KSM- 2 R,R Isomer

CAS: 98818-34-9
Formula: C₁₅H₂₁NO₃
MW: 263.33 g/mol

VQ-024381

Reference Standard

Atazanavir S,S,R,S-Diastereomer chemical structure

Atazanavir S,S,R,S-Diastereomer

CAS: 1292296-10-6
Formula: C₃₈H₅₂N₆O₇
MW: 704.9 g/mol

VQ-021636

Reference Standard

Atenolol Cyano Epoxide chemical structure

Atenolol Cyano Epoxide

CAS: 35198-42-6
Formula: C₁₁H₁₁NO₂
MW: 189.21 g/mol

VQ-024387

Reference Standard

Atipamezole Impurity 3 chemical structure

Atipamezole Impurity 3

CAS: 2581300-47-0
Formula: C₃₃H₃₀N₂O₂
MW: 486.6 g/mol

VQ-035333

Reference Standard

Atogepant Enantiomer chemical structure

Atogepant Enantiomer

CAS: 2733814-47-4
Formula: C₂₉H₂₃F₆N₅O₃
MW: 603.5 g/mol

VQ-024391

Reference Standard

Atogepant Ester Impurity chemical structure

Atogepant Ester Impurity

CAS: 1375541-24-4
Formula: C₁₆H₁₃N₃O₃
MW: 295.29 g/mol

VQ-042747

Reference Standard

Atogepant Impurity 3

Atogepant Impurity 3

CAS: 1375471-13-8
Formula: C₁₉H₂₂F₆N₂O₃
MW: 440.38 g/mol

VQ-047458

Need a price, a spec or a custom compound?

Send us your list — product names or CAS numbers, grade, quantity and destination. Our team replies with a formal quotation, COA and lead time.

Request a quote Contact sales