919768-55-1

5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid,7-[[(2S)-2-(acetylamino)-6-[[[(4-nitrophenyl)methoxy]carbonyl]amino]-1-oxohexyl]amino]-3-[(acetyloxy)methyl]-8-oxo-, diphenylmethyl ester,(6R,7R)-