1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(1R)-1-hydroxyethyl]-3-[[4-(methoxycarbonyl)-5-thiazolyl]thio]-4-methyl-7-oxo-, (2,2-dimethyl-1-oxopropoxy)methyl ester, (4R,5S,6S)-
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