SMILES: C1=C(C2=C(C(=O)C1=O)NC=C2C[C@@H](C(=O)O)N)SC[C@@H](C(=O)O)N
Description: 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.