1-((3,4-Dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)methyl)-4-(2-methylphenyl)piperazine 2HCl 70070-16-5 Piperazine, 1-((3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)methyl)-4-(2-methylphenyl)-, dihydrochloride