(2-(Tetrahydro-1,4,5-oxadiazepin-4(5H)-yl)ethyl)guanidine dihydrochloride 4-(2-Guanidinoethyl)-perhydro-1,4,5-oxadiazepine dihydrochloride 98748-85-7 Guanidine, (2-(tetrahydro-1,4,5-oxadiazepin-4(5H)-yl)ethyl)-, dihydrochloride