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