(4-nitrophenyl)methyl (2S,4S)-4-acetylsulfanyl-2-[[(2-methylpropan-2-yl)oxycarbonyl-sulfamoylamino]methyl]pyrrolidine-1-carboxylate; 4-Nitrobenzyl (2S,4S)-4-(acetylsulfanyl)-2-{[(tert-butoxycarbonyl)(sulfamoyl)amino]methyl}pyrrolidine-1-carboxylate; 4-Nitrobenzyl (2S,4S)-4-acetylsulfanyl-2-{[{[(2-methyl-2-propanyl)oxy]carbonyl}(sulfamoyl)amino]methyl}-1-pyrrolidinecarboxylate; 4-Nitrobenzyl (2S,4S)-4-acetylthio-2-[[N-sulfamoyl-N-(tert-butoxycarbonyl)amino]methyl]pyrrolidine-1-carboxylate; Doripenem side-chain; ACS-PNZ-PYRROLIDYL-(BOC)-NSO2NH2; side chain for Doripenem; Side Chain of DoripeneM