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Impurities & Reference Standards

API Impurities

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

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Reference Standard

Atorvastatin-Amlodipine Adduct chemical structure

Atorvastatin-Amlodipine Adduct

CAS: 425408-16-8
Formula: C₅₃H₅₈ClFN₄O₉
MW: 949.5 g/mol

VQ-024411

Reference Standard

Atorvastatin(5S,3R)Isomer Impurity

Atorvastatin(5S,3R)Isomer Impurity

CAS: 2088732-00-5
Formula: C₁₁H₁₉NO₄
MW: 229.3 g/mol

VQ-047471

Reference Standard

Atovaquone Impurity 3 chemical structure

Atovaquone Impurity 3

CAS: 95233-36-6
Formula: C₁₄H₁₇ClO
MW: 236.73 g/mol

VQ-024420

Reference Standard

Atovaquone Impurity 4 chemical structure

Atovaquone Impurity 4

CAS: 2171347-18-3
Formula: C₁₄H₁₇ClO
MW: 236.73 g/mol

VQ-044624

Reference Standard

Atovaquone Impurity 9 chemical structure

Atovaquone Impurity 9

CAS: 1100053-58-4
Formula: C₂₂H₁₉ClO₂
MW: 350.8 g/mol

VQ-035841

Reference Standard

Atovaquone Indene Isomer

Atovaquone Indene Isomer

CAS: 2518264-74-7
Formula: C₂₂H₁₉ClO₃
MW: 366.84 g/mol

VQ-035842

Reference Standard

Atovaquone RC 4 chemical structure

Atovaquone RC 4

CAS: 165317-79-3
Formula: C₁₃H₁₃ClO₂
MW: 236.69 g/mol

VQ-045285

Reference Standard

Atracurium Besylate - Impurity A chemical structure

Atracurium Besylate - Impurity A

CAS: 87046-74-0
Formula: C₅₂H₆₉N₂O₁₂⁺
MW: 914.1 g/mol

VQ-047476

Reference Standard

Atracurium Besylate-Impurity C

Atracurium Besylate-Impurity C

CAS: 2767988-75-8
Formula: C₃₂H₄₄INO₈
MW: 697.6 g/mol

VQ-043054

Reference Standard

Atracurium Impurity C1 (trans-Monoacrylate) chemical structure

Atracurium Impurity C1 (trans-Monoacrylate)

CAS: 155913-32-9
Formula: C₃₈H₄₉NO₁₁S
MW: 727.9 g/mol

VQ-047481

Reference Standard

Atropic Acid chemical structure

CAS: 492-38-6
Formula: C₉H₈O₂
MW: 148.16 g/mol

VQ-024434

Reference Standard

Atropine Impurity 17 chemical structure

Atropine Impurity 17

CAS: 17488-50-5
Formula: C₁₇H₂₃NO₄
MW: 305.4 g/mol

VQ-035859

Reference Standard

Atropine Impurity 2 chemical structure

Atropine Impurity 2

CAS: 4132-71-2
Formula: C₁₁H₁₆O₂
MW: 180.24 g/mol

VQ-047485

Reference Standard

Atropine Impurity 3 chemical structure

Atropine Impurity 3

CAS: 73109-76-9
Formula: C₁₁H₁₆O₂
MW: 180.24 g/mol

VQ-047486

Reference Standard

Atropine Impurity 30 chemical structure

Atropine Impurity 30

CAS: 78215-11-9
Formula: C₁₇H₂₃NO₄
MW: 305.4 g/mol

VQ-047488

Reference Standard

Atropine Impurity 4 chemical structure

Atropine Impurity 4

CAS: 4132-76-7
Formula: C₁₁H₁₆O₂
MW: 180.24 g/mol

VQ-047487

Reference Standard

Atropine Methyl Bromide chemical structure

Atropine Methyl Bromide

CAS: 2870-71-5
Formula: C₁₈H₂₆BrNO₃
MW: 384.3 g/mol

VQ-035852

Reference Standard

Auristatin E chemical structure

CAS: 160800-57-7
Formula: C₄₀H₆₉N₅O₇
MW: 732 g/mol

VQ-035861

Reference Standard

Avanafi Thiomethyl Analog chemical structure

Avanafi Thiomethyl Analog

CAS: 1364671-62-4
Formula: C₁₉H₁₉ClN₆O₂S
MW: 430.9 g/mol

VQ-043059

Reference Standard

Avanafil Acid Impurity(R Isomer) chemical structure

Avanafil Acid Impurity(R Isomer)

CAS: 1638497-25-2
Formula: C₁₈H₂₁ClN₄O₄
MW: 392.8 g/mol

VQ-029293

Reference Standard

Avanafil Amide Analog chemical structure

Avanafil Amide Analog

CAS: 372117-54-9
Formula: C₁₈H₂₂ClN₅O₃
MW: 391.9 g/mol

VQ-034790

Reference Standard

Avanafil Deschloro impurity chemical structure

Avanafil Deschloro impurity

CAS: 330784-50-4
Formula: C₂₃H₂₇N₇O₃
MW: 449.5 g/mol

VQ-021682

Reference Standard

Avanafil diamine impurity

Avanafil diamine impurity

CAS: 1643811-29-3
Formula: C₂₆H₂₅Cl₂N₇O₃
MW: 554.43 g/mol

VQ-021683

Reference Standard

Avanafil Dichloro Impurity

Avanafil Dichloro Impurity

CAS: 2520113-66-8
Formula: C₂₃H₂₅Cl₂N₇O₃
MW: 518.4 g/mol

VQ-024437

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