The molecule is a polypeptide composed of dipeptide Gly-Arg units joined via peptide linkages. It derives from a glycine and a L-arginine.
(2S)-2-[[2-[[(2S)-2-[(2-aminoacetyl)amino]-5-(diaminomethylideneamino)pentanoyl]amino]acetyl]amino]-5-(diaminomethylideneamino)pentanoic acid