METHODS Terazosin hydrochloride was synthesized from anhydro-piperazine via acylation,reduction,amination,salification etc.

法以无水哌为起始,酰化、还、胺化、成盐反应制得盐酸特拉。

METHODS Balsalazide disodium was synthesized by reactions of condensation , reduction, diazotization , coupling and salification from 4-nitrobenzoyl chloride.

法以对硝基苯甲酰氯为起始,缩合、还、重氮化、偶合、成盐反应制得巴柳氮二钠。