(2-(Hexahydro-1H-azepin-1-yl)ethyl)guanidine sulfate 1-(N-Hexamethylenimino)-ethyl-2-guanidine sulfate 2878-51-5 Gemedine Guanidine, (2-(hexahydro-1H-azepin-1-yl)ethyl)-, sulfate