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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

Metoprolol Acid Methyl Ester chemical structure

Metoprolol Acid Methyl Ester

CAS: 29121-23-1
Formula: C₁₅H₂₃NO₄
MW: 281.35 g/mol

VQ-049093

Reference Standard

Metoprolol Epoxy Ester Impurity chemical structure

Metoprolol Epoxy Ester Impurity

CAS: 76805-25-9
Formula: C₁₃H₁₆O₄
MW: 236.26 g/mol

VQ-043635

Reference Standard

Metoprolol Hydroxy Epoxide Impurity chemical structure

Metoprolol Hydroxy Epoxide Impurity

CAS: 104857-48-9
Formula: C₁₁H₁₄O₃
MW: 194.23 g/mol

In stock

Reference Standard

Metronidazole Benzoate chemical structure

Metronidazole Benzoate

CAS: 13182-89-3
Formula: C₁₃H₁₃N₃O₄
MW: 275.26 g/mol

VQ-023118

Reference Standard

Metronidazole Impurity 2 chemical structure

Metronidazole Impurity 2

CAS: 19765-12-9
Formula: C₈H₁₃N₃O₄
MW: 215.21 g/mol

VQ-049099

Reference Standard

Mexazolam Impurity A

Mexazolam Impurity A

CAS: 5220-29-1
Formula: C₁₇H₁₆Cl₂N₂O₂
MW: 351.23 g/mol

VQ-031865

Reference Standard

Mexiletine HCl Impurities,KOE 5692 Cyclicl imine impurity chemical structure

Mexiletine HCl Impurities,KOE 5692 Cyclicl imine impurity

CAS: 284486-96-0
Formula: C₁₁H₁₃NO
MW: 175.23 g/mol

VQ-026674

Reference Standard

Micafungin Impurity 20

Micafungin Impurity 20

CAS: 179163-68-9
Formula: C₂₁H₂₁NO₄
MW: 351.4 g/mol

VQ-049103

Reference Standard

Micafungin Side Chain Acid chemical structure

Micafungin Side Chain Acid

CAS: 179162-55-1
Formula: C₂₁H₂₁NO₄
MW: 351.4 g/mol

VQ-031876

Reference Standard

Micafungin Side Chain Acid Benzotriazole Ester chemical structure

Micafungin Side Chain Acid Benzotriazole Ester

CAS: 235112-66-0
Formula: C₂₇H₂₄N₄O₄
MW: 468.5 g/mol

VQ-031877

Reference Standard

Miconazole Impurity B chemical structure

Miconazole Impurity B

CAS: 913837-72-6
Formula: C₁₈H₁₅Cl₃N₂O
MW: 381.7 g/mol

VQ-038393

Reference Standard

Miconazole Impurity H nitarte salt chemical structure

Miconazole Impurity H nitarte salt

CAS: 203264-09-9
Formula: C₁₈H₁₇Cl₂N₃O₄
MW: 410.2 g/mol

VQ-038390

Reference Standard

Miconazole Related Compound I chemical structure

Miconazole Related Compound I

CAS: 24169-00-4
Formula: C₁₈H₁₆Cl₃N₃O₄
MW: 444.7 g/mol

VQ-038391

Reference Standard

Midazolam - Impurity I chemical structure

Midazolam - Impurity I

CAS: 59467-69-5
Formula: C₁₈H₁₅ClFN₃
MW: 327.8 g/mol

VQ-044847

Reference Standard

Midazolam Impurity M chemical structure

Midazolam Impurity M

CAS: 2531288-23-8
Formula: C₂₂H₁₇ClFN₃O₄
MW: 441.8 g/mol

VQ-044842

Reference Standard

Midodrine Impurity 10 chemical structure

Midodrine Impurity 10

CAS: 55703-81-6
Formula: C₁₂H₁₆O₄
MW: 224.25 g/mol

In stock

Reference Standard

Midostaurin Impurity D chemical structure

Midostaurin Impurity D

CAS: 2573122-12-8
Formula: C₃₅H₃₀N₄O₅
MW: 586.6 g/mol

VQ-031892

Reference Standard

Miglustat Impurity B chemical structure

Miglustat Impurity B

CAS: 19684-32-3
Formula: C₉H₁₄O₆
MW: 218.2 g/mol

VQ-038400

Reference Standard

Miglustat Impurity C (Mixture of isomers,open and cyclic)

Miglustat Impurity C (Mixture of isomers,open and cyclic)

CAS: 19684-22-1
Formula: C₆H₁₀O₆
MW: 178.14 g/mol

VQ-031900

Reference Standard

Milbemycin A3 chemical structure

CAS: 51596-10-2
Formula: C₃₁H₄₄O₇
MW: 528.7 g/mol

VQ-026697

Reference Standard

Milbemycin A3 Oxime chemical structure

Milbemycin A3 Oxime

CAS: 114177-14-9
Formula: C₃₁H₄₃NO₇
MW: 541.7 g/mol

VQ-031905

Reference Standard

Milbemycin A4 chemical structure

CAS: 51596-11-3
Formula: C₃₂H₄₆O₇
MW: 542.7 g/mol

VQ-026695

Reference Standard

Milbemycin A4 Oxime chemical structure

Milbemycin A4 Oxime

CAS: 93074-04-5
Formula: C₃₂H₄₅NO₇
MW: 555.7 g/mol

VQ-031906

Reference Standard

Milbemycin K chemical structure

CAS: 86691-97-6
Formula: C₃₂H₄₄O₇
MW: 540.7 g/mol

VQ-026696

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