1-(2-Benzylbenzyl)-4-(n-butyl)piperazine di(hydrogen maleate) 1-Butyl-4-((2-(phenylmethyl)phenyl)methyl)piperazine dimaleate 37652-61-2 Piperazine, 1-butyl-4-((2-(phenylmethyl)phenyl)methyl)-, (Z)-2-butenedioate (1:2)