1-((2-Chlorophenyl)(3-chlorophenyl)methyl)-4-methylpiperazine (Z)-2-butenedioate (1:2) 1-(2,3'-Dichlorobenzhydryl)-4-methylpiperazine bis(hydrogen maleate) 126551-80-2 Piperazine, 1-((2-chlorophenyl)(3-chlorophenyl)methyl)-4-methyl-, (Z)-2-butenedioate (1:2)