1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-3-[[1-(1H-pyrrol-2-ylcarbonyl)-3-azetidinyl]thio]-, monosodium salt, (4R,5S,6S)-
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