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1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(1R)-1-[[(1,1-dimethylethyl)dimethylsilyl]oxy]ethyl]-4-methyl-7-oxo-3-[[1-[4-[(2-propenyloxy)carbonyl]-2-thiazolyl]-3-azetidinyl]thio]-,(4-nitropheny related products: