sodium (6R-trans)-3-(acetoxymethyl)-7-[[[3-(2-chlorophenyl)-5-methylisoxazol-4-yl]carbonyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

(6R)-3-[(Acetyloxy)methyl]-7α-[[[3-(2-chlorophenyl)-5-methyl-4-isoxazolyl]carbonyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid sodium salt