sodium (6R,7S)-7-(2-(((S)-2-amino-2-carboxyethyl)thio)acetamido)-7-methoxy-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
sodium (6R,7S)-7-(2-(((S)-2-amino-2-carboxyethyl)thio)acetamido)-7-methoxy-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate