2-[4-(tert-Butoxycarbonyl)piperazin-1-yl]-5-nitrobenzohydrazide4-[2-(Hydrazinocarbonyl)-4-nitrophenyl]piperazine, N1-BOC protected 95+%2-[4-(tert-Butoxycarbonyl)piperazin-1-yl]-5-nitrobenzoic acid hydrazidetert-Butyl 4-[2-(hydrazinocarbonyl)-4-nitrophenyl]piperazine-1-carboxylate