1-(6-Ethoxycarbonylhexyl)-4-(o-methoxyphenyl)piperazine dihydrochloride 1-Piperazineheptanoic acid, 4-(2-methoxyphenyl)-, ethyl ester, dihydrochloride 81185-85-5 81186-05-2 Ethyl 4-(2-methoxyphenyl)-1-piperazineheptanoate dihydrochloride