Impurity Reference Standards

Pharmacopeial Impurities (EP / USP / BP)

Named EP, USP and BP impurities and related compounds for pharmacopoeial methods, system suitability and peak identification.

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Acesulfame Potassium EP Impurity B

CAS: 72827-08-8
Formula: C₄H₄ClNO₄S
MW: 197.6 g/mol

ZX-020470

Acetazolamide EP Impurity A

CAS: 60320-32-3
Formula: C₄H₄ClN₃OS
MW: 177.61 g/mol

ZX-020471

Acetazolamide EP Impurity B

CAS: 5393-55-5
Formula: C₄H₅N₃OS
MW: 143.17 g/mol

ZX-019779

Acetazolamide EP Impurity C

CAS: 32873-56-6
Formula: C₄H₅N₃OS₂
MW: 175.2 g/mol

ZX-019780

Acetazolamide EP Impurity D

CAS: 14949-00-9
Formula: C₂H₄N₄O₂S₂
MW: 180.21 g/mol

ZX-020472

Acetazolamide EP Impurity E

CAS: 827026-60-8
Formula: C₄H₅N₃O₄S₂
MW: 223.2 g/mol

ZX-019781

Acetazolamide EP Impurity F

CAS: 80495-47-2
Formula: C₈H₉N₇O₆S₄
MW: 427.5 g/mol

ZX-019782

Acetylcysteine EP Impurity C

CAS: 5545-17-5
Formula: C₁₀H₁₆N₂O₆S₂
MW: 324.4 g/mol

ZX-020476

Acetylcysteine EP Impurity D

CAS: 18725-37-6
Formula: C₇H₁₁NO₄S
MW: 205.23 g/mol

ZX-020475

Acetylsalicylic Acid EP Impurity D

CAS: 530-75-6
Formula: C₁₆H₁₂O₆
MW: 300.26 g/mol

ZX-005554

Acetylsalicylic Acid EP Impurity E

CAS: 552-94-3
Formula: C₁₄H₁₀O₅
MW: 258.23 g/mol

ZX-005555

Aciclovir EP Impurity C

CAS: 91702-61-3
Formula: C₈H₁₁N₅O₃
MW: 225.2 g/mol

ZX-019788

Aciclovir EP Impurity F

CAS: 110104-37-5
Formula: C₁₀H₁₃N₅O₄
MW: 267.24 g/mol

ZX-019789

Aciclovir EP Impurity G

CAS: 75128-73-3
Formula: C₁₂H₁₅N₅O₅
MW: 309.28 g/mol

ZX-019790

Aciclovir EP Impurity I

CAS: 1797832-75-7
Formula: C₁₄H₁₆N₁₀O₄
MW: 388.34 g/mol

ZX-019792

Aciclovir EP Impurity J

CAS: 166762-90-9
Formula: C₁₄H₁₆N₁₀O₄
MW: 388.34 g/mol

ZX-019793

Aciclovir EP Impurity L

CAS: 3056-33-5
Formula: C₉H₉N₅O₃
MW: 235.2 g/mol

ZX-019794

Aciclovir EP Impurity M

CAS: 91702-60-2
Formula: C₁₂H₁₅N₅O₅
MW: 309.28 g/mol

ZX-019797

Aciclovir EP Impurity P

CAS: 23169-33-7
Formula: C₇H₉N₅O₂
MW: 195.18 g/mol

ZX-019796

Acitretin EP Impurity A

CAS: 69427-46-9
Formula: C₂₁H₂₆O₃
MW: 326.4 g/mol

ZX-019722

Acitretin EP Impurity B

CAS: 54350-48-0
Formula: C₂₃H₃₀O₃
MW: 354.5 g/mol

ZX-019784

Acyclovir EP Impurity H

CAS: 133186-23-9
Formula: C₁₇H₁₇N₅O₅
MW: 371.3 g/mol

ZX-019791

Adapalene EP Impurity A

CAS: 932033-58-4
Formula: C₂₂H₁₄O₄
MW: 342.3 g/mol

ZX-020481

Adapalene EP Impurity B

CAS: 1346599-76-5
Formula: C₂₈H₂₈O₄
MW: 428.5 g/mol

ZX-020486

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