The molecule is a dipeptide zwitterion resulting from transfer of a proton from the carboxy to the amino group of any (E)-1-(glycyl-L-cystein-S-yl)-omega-(methylthio)alkylhydroximate; major species at pH 7.3.
2-[[(2R)-2-azaniumyl-3-[(E)-N-hydroxy-C-(3-methylsulfanylpropyl)carbonimidoyl]sulfanylpropanoyl]amino]acetate