“…The aminoguanidinium phosphotungstate (145), tetrabromoaurate (57), hexabromotellurite (56), and tetrachloropalladinate (55) have been described, and in addition a complex compound with thiourea (5) has been prepared. Hantzsch (58) has shown that a primary sulfate of aminoguanidine is formed in absolute sulfuric acid, aminoguanidine in this case acts as a tetraacid base.…”