Impurities and Working Standards

The following products are in stock and can be immediately dispatched when an order confirmation is received. Also, any non-listed Impurities could be provided after request.

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E

Entacapone
Impurity B

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Chemical Name: Ethyl (2E)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)prop-2-enoate
CAS No.: N/A
Cat. No.: BRI.ENT.B

Impurity C

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Chemical Name: 3,4-Dihydroxy-5-nitrobenzaldehyde
CAS No.: 116313-85-0
Cat. No.: BRI.ENT.C

Impurity F

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Chemical Name: (2E)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)prop-2-enoic acid
CAS No.: 160391-70-8
Cat. No.: BRI.ENT.F

Impurity G

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Chemical Name: (2E)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-methylprop-2-enamide
CAS No.: 1364322-41-7
Cat. No.: BRI.ENT.G

Impurity I

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Chemical Name: Propyl (2E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)prop-2-enoate
CAS No.: 1364322-42-8
Cat. No.: BRI.ENT.I

Eslicarbazepine Acetate
Esomeprazole
Ezetimibe

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