(2-(4-Methylhexahydro-1H-azepin-1-yl)ethyl)guanidine sulfate (2-(Hexahydro-4-methyl-1H-azepin-1-yl)ethyl)guanidine sulfate 2948-77-8 Guanidine, (2-(hexahydro-4-methyl-1H-azepin-1-yl)ethyl)-, sulfate