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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Buspirone EP Impurity I

CAS: 2725354-99-2
Formula: C₂₁H₃₀ClN₅O₂
MW: 419.9 g/mol

ZX-020974

Buspirone EP Impurity J

CAS: 2726492-72-2
Formula: C₃₄H₅₂N₆O₅
MW: 624.8 g/mol

ZX-020966

Buspirone EP Impurity K

CAS: 1075-89-4
Formula: C₉H₁₃NO₂
MW: 167.2 g/mol

ZX-020085

Buspirone EP Impurity L

CAS: 21098-11-3
Formula: C₁₃H₂₀ClNO₂
MW: 257.75 g/mol

ZX-020967

Buspirone EP Impurity M

CAS: 80827-62-9
Formula: C₁₃H₂₀BrNO₂
MW: 302.21 g/mol

ZX-020970

Buspirone EP Impurity N

CAS: 257877-44-4
Formula: C₂₂H₃₂N₂O₄
MW: 388.5 g/mol

ZX-020968

Cabergoline EP Impurity A

CAS: 81409-74-7
Formula: C₁₈H₂₀N₂O₂
MW: 296.4 g/mol

ZX-005610

Cabergoline EP Impurity B

CAS: 166533-36-4
Formula: C₂₆H₃₇N₅O₂
MW: 451.6 g/mol

ZX-020985

Cabergoline EP Impurity C

CAS: 126554-50-5
Formula: C₂₉H₄₂N₆O₃
MW: 522.7 g/mol

ZX-020986

Cabergoline EP Impurity D

CAS: 85329-86-8
Formula: C₂₃H₃₂N₄O
MW: 380.5 g/mol

ZX-020091

Caffeine EP Impurity B

CAS: 7597-60-6
Formula: C₇H₁₀N₄O₃
MW: 198.18 g/mol

ZX-020405

Caffeine EP Impurity C

CAS: 519-32-4
Formula: C₈H₁₀N₄O₂
MW: 194.19 g/mol

ZX-020099

Caffeine EP Impurity E

CAS: 20041-90-1
Formula: C₇H₁₂N₄O
MW: 168.2 g/mol

ZX-020098

Caffeine EP Impurity E Hydrochloride (Caffeidine Hydrochloride)

CAS: 107605-95-8
Formula: C₇H₁₃ClN₄O
MW: 204.66 g/mol

ZX-028406

Caffeine EP Impurity F

CAS: 611-59-6
Formula: C₇H₈N₄O₂
MW: 180.16 g/mol

ZX-020097

Calcifediol EP Impurity A

CAS: 61585-29-3
Formula: C₂₇H₄₄O₂
MW: 400.6 g/mol

ZX-020101

Calcifediol EP Impurity B

CAS: 22145-68-2
Formula: C₂₇H₄₄O₂
MW: 400.6 g/mol

ZX-020102

Calcifediol EP Impurity C

CAS: 39932-44-0
Formula: C₂₇H₄₄O₂
MW: 400.6 g/mol

ZX-020103

Calcifediol EP Impurity D

CAS: 1233749-00-2
Formula: C₂₇H₄₄O₂
MW: 400.6 g/mol

ZX-020104

Calcipotriol EP Impurity A

CAS: 126860-83-1
Formula: C₂₇H₃₈O₃
MW: 410.6 g/mol

ZX-020992

Calcipotriol EP Impurity C

CAS: 113082-99-8
Formula: C₂₇H₄₀O₃
MW: 412.6 g/mol

ZX-020991

Calcipotriol EP Impurity D

CAS: 112827-99-3
Formula: C₂₇H₄₀O₃
MW: 412.6 g/mol

ZX-020105

Calcipotriol EP Impurity F

CAS: 112875-61-3
Formula: C₃₉H₆₈O₃Si₂
MW: 641.1 g/mol

ZX-023084

Calcitonin Salmon EP Impurity E

CAS: 115472-96-3
Formula: C₁₄₇H₂₄₂N₄₄O₅₀S₂
MW: 3489.9 g/mol

ZX-028411

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