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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Risedronate Sodium EP Impurity B (Monohydrate Salt)

CAS: 1220806-40-5
Formula: C₇H₁₃NO₈P₂
MW: 301.13 g/mol

ZX-032214

Risedronate Sodium EP Impurity E

CAS: 75755-10-1
Formula: C₇H₁₁NO₆P₂
MW: 267.11 g/mol

ZX-022664

Risperidone EP Impurity A

CAS: 691007-09-7
Formula: C₂₃H₂₈F₂N₄O₂
MW: 430.5 g/mol

ZX-005941

Risperidone EP Impurity B

CAS: 132961-05-8
Formula: C₂₃H₂₈F₂N₄O₂
MW: 430.5 g/mol

ZX-005942

Risperidone EP Impurity C

CAS: 144598-75-4
Formula: C₂₃H₂₇FN₄O₃
MW: 426.5 g/mol

ZX-005943

Risperidone EP Impurity D

CAS: 1199589-74-6
Formula: C₂₃H₂₇FN₄O₂
MW: 410.5 g/mol

ZX-005944

Risperidone EP Impurity E

CAS: 1346602-28-5
Formula: C₂₄H₂₉FN₄O₂
MW: 424.5 g/mol

ZX-005945

Risperidone EP Impurity F

CAS: 1346603-86-8
Formula: C₂₄H₂₇FN₄O₄
MW: 454.5 g/mol

ZX-026743

Risperidone EP Impurity H

CAS: 158697-67-7
Formula: C₂₃H₂₇F₂N₃O₂
MW: 415.5 g/mol

ZX-005946

Risperidone EP Impurity I

CAS: 1329796-66-8
Formula: C₃₅H₃₉F₂N₅O₃
MW: 615.7 g/mol

ZX-005947

Risperidone EP Impurity K

CAS: 106266-09-5
Formula: C₂₃H₂₈N₄O₂
MW: 392.5 g/mol

ZX-005948

Risperidone EP Impurity L

CAS: 63234-80-0
Formula: C₁₁H₁₅ClN₂O
MW: 226.7 g/mol

ZX-005949

Risperidone EP Impurity L (Hydrochloride)

CAS: 93076-03-0
Formula: C₁₁H₁₆Cl₂N₂O
MW: 263.16 g/mol

ZX-005950

Risperidone EP Impurity M (Freebase)

CAS: 84163-77-9
Formula: C₁₂H₁₃FN₂O
MW: 220.24 g/mol

ZX-005951

Risperidone EP Impurity M (Hydrochloride)

CAS: 84163-13-3
Formula: C₁₂H₁₄ClFN₂O
MW: 256.7 g/mol

ZX-005952

Risperidone USP Related Compound G

CAS: 152542-00-2
Formula: C₂₃H₂₈FN₃O₃
MW: 413.5 g/mol

ZX-005953

Ritonavir EP Impurity A

CAS: 154212-61-0
Formula: C₁₄H₂₃N₃O₃S
MW: 313.42 g/mol

ZX-005954

Ritonavir EP Impurity B

CAS: 765875-58-9
Formula: C₂₈H₃₆N₄O₄S
MW: 524.7 g/mol

ZX-022675

Ritonavir EP Impurity C

CAS: 1010808-43-1
Formula: C₂₅H₂₉N₃O₄S
MW: 467.6 g/mol

ZX-022673

Ritonavir EP Impurity D

CAS: 144142-33-6
Formula: C₂₈H₃₀N₄O₅S₂
MW: 566.7 g/mol

ZX-005955

Ritonavir EP Impurity F

CAS: 1010809-61-6
Formula: C₂₉H₃₄N₄O₅S
MW: 550.7 g/mol

ZX-022668

Ritonavir EP Impurity G

CAS: 2034136-66-6
Formula: C₃₇H₄₈N₆O₇S₂
MW: 752.9 g/mol

ZX-022672

Ritonavir EP Impurity H

CAS: 1010809-43-4
Formula: C₃₀H₃₂N₄O₆S
MW: 576.7 g/mol

ZX-022669

Ritonavir EP Impurity I

CAS: 165315-26-4
Formula: C₃₆H₄₆N₆O₅S₂
MW: 706.9 g/mol

ZX-022676

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