The molecule is a compound obtained from nucleophilic cleavage of the beta-lactam ring of benzylpenicillin by the amino group of L-cysteine. It is a thiazolidinedicarboxylic acid and a dicarboxylic acid. It derives from a benzylpenicillin and a L-cysteine.
(2R,4S)-2-[(1R)-2-[[(1R)-1-carboxy-2-sulfanylethyl]amino]-2-oxo-1-[(2-phenylacetyl)amino]ethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid