SMILES: C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CC3=CC=C(C=C3)O)C(=O)O)NC(=O)[C@H](CCCN=C(N)N)N
Description: The molecule is a tetrapeptide composed of L-arginine, L-tryptophan, L-serine, and L-tyrosine joined in sequence by peptide linkages. It has a role as a metabolite. It derives from a L-arginine, a L-serine, a L-tryptophan and a L-tyrosine.