(4-nitrophenyl)methyl (4R,5S,6S)-3-[(3S,5S)-5-(dimethylcarbamoyl)-1-[(4-nitrophenyl)methoxycarbonyl]pyrrolidin-3-yl]sulfanyl-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate
(4-nitrophenyl)methyl (4R,5S,6S)-3-[(3S,5S)-5-(dimethylcarbamoyl)-1-[(4-nitrophenyl)methoxycarbonyl]pyrrolidin-3-yl]sulfanyl-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate