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1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(1R)-1-hydroxyethyl]-4-methyl-3-[[1-[4-[[methyl[2-[(4-nitrophenyl)methoxy]-2-oxoethyl]amino]carbonyl]-2-thiazolyl]-3-azetidinyl]thio]-7-oxo-,(4-nitro related products: