The molecule is an amino acid zwitterion obtained from N(2)-(2-carboxyethyl)-L-arginine by the removal of a proton for both of the carboxy groups and the addition of a proton to the alpha-amino group and to the guanidyl group. It is a tautomer of a N(2)-(2-carboxyethyl)-L-arginine.
(2S)-2-(2-carboxylatoethylazaniumyl)-5-(diaminomethylideneazaniumyl)pentanoate