The molecule is a dipeptide composed of L-phenylalanine and L-arginine joined by a peptide linkage. It has a role as a metabolite. It derives from a L-phenylalanine and a L-arginine. It is a conjugate base of a Phe-Arg(1+).
(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid