134749-25-0 2,4(1H,3H)-Quinazolinedione, 6,7-dimethoxy-, bis(phenylhydrazone), monohydrochloride 6,7-Dimethoxy-2,4(1H,3H)-quinazolinedione bis(phenylhydrazone) monohydrochloride 6,7-Dimethoxy-2,4-di(2'-phenylhydrazino)quinazoline hydrochloride