5R,6R-Benzylpenicilloic Acid

(2R,4S)-2-((R)-Carboxy(2-phenylacetamido)methyl)-5,5-dimethylthiazolidine-4-carboxylic Acid; (αR,2R,4S)-4-Carboxy-5,5-dimethyl-α-[(2-phenylacetyl)amino]-2-thiazolidineacetic Acid; [2R-[2α(R*),4β]]-4-Carboxy-5,5-dimethyl-α-[(phenylacetyl)amino]-2-thiazolidineacetic Acid;