(2R,4S)-4-Mercapto-2-{3-[methyl-(4-nitro-benzyloxycarbonyl)-amino]-propyl}-pyrrolidine-1-carboxylic acid 4-nitro-benzyl ester

p-nitrobenzyl (1R,5S,6S)-6-[(R)-1-hydroxyethyl]-1-methyl-2-[(2R,4S)-2-[3-(N-methyl-N-p-nitrobenzyloxycarbonylamino)propyl]-N-p-nitrobenzyloxycarbonylpyrrolidin-4-ylthio]-1-carbapen-2-em-3-carboxylate