The molecule is an L-alpha-amino acid zwitterion formed from ovothiol B by transfer of a proton from the carboxy to the amino group; major species at pH 7.3. It derives from a L-histidine zwitterion. It is a tautomer of an ovothiol B.
(2S)-2-(methylazaniumyl)-3-(3-methyl-5-sulfanylimidazol-4-yl)propanoate