API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Doxazosin

EP Impurity A

(2RS)-2,3-dihydro-1,4-benzodioxine-2-carboxylic acid Doxazosin_EP Impurity A
Doxazosin

EP Impurity E

2,4-dichloro-6,7-dimethoxyquinazoline Doxazosin_EP Impurity E
Doxazosin

EP Impurity B

1-[(2RS)-2,3-dihydro-1,4-benzodioxin-2-ylcarbonyl]piperazine Doxazosin_EP Impurity B
Doxazosin

EP Impurity G

6,7-dimethoxy-2-(piperazin-1-yl)quinazolin-4-amine Doxazosin_EP Impurity G
Doxazosin

EP Impurity H

2,2’-(piperazine-1,4-diyl)bis(6,7-dimethoxyquinazolin-4-amine) Doxazosin_EP Impurity H
Doxazosin

EP Impurity F

4-amino-2-chloro-6,7-dimethoxy quinazoline Doxazosin_EP Impurity F