The molecule is an N-acyl-L-alpha-amino acid anion resulting from the deprotonation of the carboxy group of N-[4-(indol-3-yl)butanoyl]-L-cysteine. The major species at pH 7.3. It is a conjugate base of a N-[4-(indol-3-yl)butanoyl]-L-cysteine.
(2R)-2-[4-(1H-indol-3-yl)butanoylamino]-3-sulfanylpropanoate