(2-(Tetrahydro-1,4-oxazepin-4(5H)-yl)ethyl)guanidine dihydrochloride 4-(2-Guanidinoethyl)-perhydro-1,4-oxazepine dihydrochloride 98748-91-5 Guanidine, (2-(tetrahydro-1,4-oxazepin-4(5H)-yl)ethyl)-, dihydrochloride