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.
![Image](/images/2018/07/13/made-in-europe.png)
E
Impurity B
![Impurity B Image](/images/2018/07/17/entacapone-impurityb.jpg)
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
![Impurity C Image](/images/2018/07/17/entacapone-impurityc.jpg)
Chemical Name: 3,4-Dihydroxy-5-nitrobenzaldehyde
CAS No.: 116313-85-0
Cat. No.: BRI.ENT.C
Impurity F
![Impurity F Image](/images/2018/07/17/entacapone-impurityf.jpg)
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
![Impurity G Image](/images/2018/07/17/entacapone-impurityg.jpg)
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
![Impurity I Image](/images/2018/07/17/entacapone-impurityi.jpg)
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