1-(2-Benzylbenzyl)-4-nitrosopiperazine hydrogen maleate 1-Nitroso-4-((2-(phenylmethyl)phenyl)methyl)piperazine maleate 37652-85-0 Piperazine, 1-nitroso-4-((2-(phenylmethyl)phenyl)methyl)-, (Z) -2-butenedioate (1:1)