The molecule is an alpha-amino acid zwitterion that is S-(5-acetamido-2-hydroxyphenyl)cysteine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. It has a role as a human xenobiotic metabolite. It is a tautomer of a S-(5-acetamido-2-hydroxyphenyl)cysteine.
3-(5-acetamido-2-hydroxyphenyl)sulfanyl-2-azaniumylpropanoate