The molecule is an L-tryptophan derivative that is L-tryptophan-6,7-dione in which a cysteine unit is attached at position 4 via its side-chain thiol group. It is a L-tryptophan derivative, a L-cysteine thioether and a member of orthoquinones.
(2S)-2-amino-3-[4-[(2R)-2-amino-2-carboxyethyl]sulfanyl-6,7-dioxo-1H-indol-3-yl]propanoic acid