1-(3,4-Dihydro-6-methoxy-2H-1-benzopyran-4-yl)-4-(2-methoxyphenyl)piperazine dihydrochloride 81816-72-0 Piperazine, 1-(3,4-dihydro-6-methoxy-2H-1-benzopyran-4-yl)-4-(2-methoxyphenyl)-, dihydrochloride