1874 27 906 Guanido-dibenzoic acid.
1922 122 i. 530 Guanidoethyl alcohol.
1951 45 3433 (heading) Participation of the guanido group of arginine in the gelling of gelatin.
1967 A. Cantarow & B. Schepartz (ed. 4) xxi. 579 In the first reaction, the amidine group of arginine is transferred to glycine, forming guanidoacetate (glycocyamine) and ornithine.