1-(2-Benzylbenzyl)-4-(3-carboxypropionyl)piperazine hydrogen maleate hemihydrate 1-Piperazinebutanoic acid, gamma-oxo-4-((2-(phenylmethyl)phenyl)methyl)-, (Z)-2-butenedioate,hydrate (2:2:1) 37652-73-6 gamma-Oxo-4-((2-(phenylmethyl)phenyl)methyl)-1-piperazinebutanoic acid maleate hemihydrate