sodium;(2R)-N-[(2S,5R,6R)-2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl]-2-[(2-oxoimidazolidine-1-carbonyl)amino]-2-phenylethanimidate
A semisynthetic ampicillin-derived acylureido penicillin.