The molecule is an L-alpha-amino acid zwitterion resulting from the transfer of a proton from the carboxy group to the alpha-amino group of 6-chloro-L-tryptophan; major species at pH 7.3. It is a tautomer of a 6-chloro-L-tryptophan.
(2S)-2-azaniumyl-3-(6-chloro-1H-indol-3-yl)propanoate