2-Propanol, 1-((1,1-dimethylethyl)amino)-3-(2-(6-hydrazino-3-pyridazinyl)phenoxy)-, dihydrochloride monohydrate 72849-00-4 73398-12-6 Prizidilol hydrochloride [USAN] Prizidilol hydrochloride hydrate SK&F 92657-A2