Prazosin Impurity; N-Des((tetrahydrofuran-2-yl)methanone)) Terazosin Dihydrochloride; 6,7-dimethoxy-2-(piperazin-1-yl)quinazolin-4-amine dihydrochloride;6,7-Dimethoxy-2-(1-piperazinyl)-4-quinazolinamine Dihydrochloride; 2-(1-Piperazinyl)-4-amino-6,7-dimethoxyquinazoline-2HCl; Terazosin Related Compound A (USP); Prazosin Impurity
