1-((3,4-Dihydro-2H-1,5-benzodioxepin-7-yl)methyl)guanidine sulfate (2:1) 23474-99-9 Guanidine, 1-((3,4-dihydro-2H-1,5-benzodioxepin-7-yl)methyl)-, sulfate (2:1)