The molecule is a tripeptoid arising from cleavage of both rings of a penicillin derivative. It is a conjugate acid of a N-[(5S)-5-ammonio-5-carboxylatopentanoyl]-L-cysteinyl-D-valinate.
(2S)-2-amino-6-[[(2R)-1-[[(1R)-1-carboxy-2-methylpropyl]amino]-1-oxo-3-sulfanylpropan-2-yl]amino]-6-oxohexanoic acid