1-(3,4-Dihydro-6-methoxy-2H-1-benzopyran-4-yl)-4-(4-methoxyphenyl)piperazine dihydrochloride 81816-73-1 Piperazine, 1-(3,4-dihydro-6-methoxy-2H-1-benzopyran-4-yl)-4-(4-methoxyphenyl)-, dihydrochloride