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Piperazine 1-Phenyl-2-nitropropene 1-METHYL-4-(4-NITROPHENYL)PIPERAZINE 1-(3-Nitrophenyl)piperazin-2-one 1-(3-Nitrophenyl)piperazine 1-(2,4-DINITROPHENYL)-PIPERAZINE HCL 2-(4-methylpiperazino)-5-nitrobenzenecarbaldehyde 1-(2-Fluoro-4-nitrophenyl)piperazine 3-METHYL-1-(4-NITROPHENYL)PIPERAZINE METHYL 2-(BOC-PIPERAZIN-1-YL)-5-NITROBE&