886589-56-6

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