The molecule is an L-alpha-amino acid zwitterion resulting from the transfer of a proton from the carboxy group to the amino group of isonocardicin A. It is a conjugate acid of an isonocardicin A(1-). It is a tautomer of an isonocardicin A.
(2S)-2-azaniumyl-4-[4-[(Z)-C-[[(3S)-1-[(R)-carboxy-(4-hydroxyphenyl)methyl]-2-oxoazetidin-3-yl]carbamoyl]-N-hydroxycarbonimidoyl]phenoxy]butanoate