The molecule is a tetrapeptide composed of L-arginine, two L-phenylalanine units and L-cysteine joined in sequence by peptide linkages. It has a role as a metabolite. It derives from a L-arginine, a L-phenylalanine and a L-cysteine.
(2R)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-phenylpropanoyl]amino]-3-phenylpropanoyl]amino]-3-sulfanylpropanoic acid