The molecule is a tripeptide composed of glycine, L-arginine and L-proline joined in sequence by peptide linkages. It derives from a glycine, a L-arginine and a L-proline.
(2S)-1-[(2S)-2-[(2-aminoacetyl)amino]-5-(diaminomethylideneamino)pentanoyl]pyrrolidine-2-carboxylic acid