1,1'-Methylenebis(4-(3-chlorophenyl)piperazine) 30534-29-3 5-23-01-00176 (Beilstein Handbook Reference) BRN 0578338 Bis-(m-chlorophenylpiperazino)-methane Piperazine, 1,1'-methylenebis(4-(3-chlorophenyl)-