1-Piperazineacetamide, 4-methyl-N-(4-nitrophenyl)-N-phenyl-, (Z)-2-butenedioate (1:2) 118989-85-8 Acetamide, 2-(4-methyl-1-piperazinyl)-N-(4-nitrophenyl)-N-phenyl-, (Z)-2-butenedioate (1:2) N-(4-Nitrophenyl)-N-phenyl-2-(4-methyl-1-piperazinyl)acetamide dimaleate