1-(2-Benzylbenzyl)-4-benzylpiperazine di(hydrogen maleate) 1-(Phenylmethyl)-4-((2-(phenylmethyl)phenyl)methyl)piperazine dimaleate 37751-45-4 Piperazine, 1-(phenylmethyl)-4-((2-(phenylmethyl)phenyl)methyl)-, (Z)-2-butenedioate (1:2)