19971-73-4 4-((4-(2-Pyrimidinyl)-1-piperazinyl)methyl)pyrocatechol hydrochloride hydrate (2:4:1) 50602-50-1 Pyrocatechol, 4-((4-(2-pyrimidinyl)-1-piperazinyl)methyl)-, hydrochloride, hydrate (2:4:1)