Product Application： 2,4-Dichloro-6,7-dimethoxyquinazoline (Doxazosin EP Impurity E) is an intermediate in the preparation of potential inhibitors of epidermal growth factor receptor kinases. An intermediate in the preparation of Terazosin (T105000). 2,4-Dichloro-6,7-dimethoxyquinazoline may be used as a reactant in the preparation of the following potential bioactive compounds: 2-chloro-4,6,7-trimethoxyquinazoline 2-chloro-6,7-dimethoxy-4(3H)-quinazolinone 2,4-diamino-6,7-dimethoxy quinazolines 2-chloro-4-(3-bromoanilino)-6,7-dimethoxyquinazoline