The molecule is the conjugate base of S-carboxymethyl-L-cysteine having anionic carboxy groups and a protonated amino group; major species at pH 7.3. It is an alpha-amino-acid anion and a dicarboxylic acid anion. It is a conjugate base of a S-carboxymethyl-L-cysteine.
(2R)-2-azaniumyl-3-(carboxylatomethylsulfanyl)propanoate