(5S,6R)-(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl 6-((S)-1-hydroxyethyl)-7-oxo-3-((R)-tetrahydrofuran-2-yl)-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 1g

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