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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Atorvastatin Calcium EP Impurity E

CAS: 501121-34-2
Formula: C₃₃H₃₅FN₂O₅
MW: 558.6 g/mol

ZX-020706

Atorvastatin EP Impurity A

CAS: 433289-84-0
Formula: C₃₃H₃₆N₂O₅
MW: 540.6 g/mol

ZX-005586

Atorvastatin EP Impurity A (Calcium Salt)

CAS: 433289-83-9
Formula: C₆₆H₇₀CaN₄O₁₀
MW: 1119.4 g/mol

ZX-005587

Atorvastatin EP Impurity A (Sodium Salt)

CAS: 1516864-05-3
Formula: C₃₃H₃₆N₂O₅
MW: 540.6 g/mol

ZX-005588

Atorvastatin EP Impurity B

CAS: 842103-12-2
Formula: C₃₃H₃₅FN₂O₅
MW: 558.6 g/mol

ZX-020705

Atorvastatin EP Impurity C (Calcium Salt)

CAS: 693793-53-2
Formula: C₆₆H₆₆CaF₄N₄O₁₀
MW: 1191.3 g/mol

ZX-005589

Atorvastatin EP Impurity C (Freebase)

CAS: 693794-20-6
Formula: C₃₃H₃₄F₂N₂O₅
MW: 576.6 g/mol

ZX-005590

Atorvastatin EP Impurity C Sodium salt

CAS: 1807481-00-0
Formula: C₃₃H₃₃F₂N₂NaO₅
MW: 598.6 g/mol

ZX-023416

Atorvastatin EP Impurity D

CAS: 148146-51-4
Formula: C₂₆H₂₂FNO₄
MW: 431.5 g/mol

ZX-019910

Atorvastatin EP Impurity E Calcium salt

CAS: 1105067-88-6
Formula: C₆₆H₆₈CaF₂N₄O₁₀
MW: 1155.3 g/mol

ZX-023404

Atorvastatin EP Impurity F

CAS: 887196-24-9
Formula: C₄₀H₄₈FN₃O₈
MW: 717.8 g/mol

ZX-005591

Atorvastatin EP Impurity F (Calcium Salt)

CAS: 1105067-87-5
Formula: C₈₀H₉₄CaF₂N₆O₁₆
MW: 1473.7 g/mol

ZX-005592

Atorvastatin EP Impurity G

CAS: 887324-53-0
Formula: C₃₄H₃₇FN₂O₅
MW: 572.7 g/mol

ZX-005593

Atorvastatin EP Impurity H

CAS: 125995-03-1
Formula: C₃₃H₃₃FN₂O₄
MW: 540.6 g/mol

ZX-005594

Atorvastatin EP Impurity I

CAS: 125971-95-1
Formula: C₄₀H₄₇FN₂O₅
MW: 654.8 g/mol

ZX-019911

Atorvastatin EP Impurity J

CAS: 1105067-93-3
Formula: C₃₃H₃₃FN₂O₄
MW: 540.6 g/mol

ZX-019736

Atorvastatin EP Impurity K

CAS: 345891-62-5
Formula: C₃₄H₃₇FN₂O₅
MW: 572.7 g/mol

ZX-005595

Atorvastatin EP Impurity M

CAS: 1146977-93-6
Formula: C₃₅H₃₉FN₂O₅
MW: 586.7 g/mol

ZX-005596

Atorvastatin EP Impurity P

CAS: 581772-29-4
Formula: C₃₆H₃₉FN₂O₅
MW: 598.7 g/mol

ZX-005597

Atorvastatin EP Impurity Q

CAS: 906552-18-9
Formula: C₃₃H₃₅FN₂O₆
MW: 574.6 g/mol

ZX-020715

Atovaquone EP Impurity B

CAS: 137732-39-9
Formula: C₂₂H₁₉ClO₃
MW: 366.8 g/mol

ZX-027692

Atovaquone EP Impurity C

CAS: 1809464-27-4
Formula: C₂₂H₁₇ClO₃
MW: 364.8 g/mol

ZX-020721

Atovaquone EP Impurity D

CAS: 129700-41-0
Formula: C₂₃H₂₁ClO₃
MW: 380.9 g/mol

ZX-020722

Atracurium Besylate EP Impurity B

CAS: 64228-84-8
Formula: C₅₁H₆₆N₂O₁₂
MW: 899.1 g/mol

ZX-020726

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