1-((3,4-Dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)methyl)-4-(4-methoxyphenyl)piperazine 2HCl 70070-19-8 Piperazine, 1-((3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)methyl)-4-(4-methoxyphenyl)-, dihydrochloride