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.
(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-hydroxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoic acid