The molecule is a tripeptide composed of L-phenylalanine, L-arginine, and L-threonine joined in sequence by peptide linkages. It derives from a L-phenylalanine, a L-arginine and a L-threonine.
(2S,3R)-2-[[(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-hydroxybutanoic acid