The molecule is an L-alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of L-Cys(IAN). It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a tautomer of a L-Cys(IAN).
(2R)-2-azaniumyl-3-[cyano(1H-indol-3-yl)methyl]sulfanylpropanoate