A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Doxazosin Doxazocin EP Impurity A Doxazocin EP Impurity B Doxazocin EP Impurity C Doxazocin EP Impurity D Doxazocin EP Impurity E Doxazocin EP Impurity F Doxazosin EP Impurity G Doxazosin EP Impurity H