1-((3,4-Dihydro-2H-1-benzopyran-3-yl)methyl)-4-(2-methoxyphenyl)piperazine dihydrochloride 83823-46-5 Piperazine, 1-((3,4-dihydro-2H-1-benzopyran-3-yl)methyl)-4-(2-methoxyphenyl)-, dihydrochloride