(Dithiodiethylene)diguanidine dihydrobromide 1072-13-5 15086-17-6 Di(2-guanidinoethyl)disulfide dihydrobromide Guanidine, 1,1'-(dithiodiethylene)di-, dihydrobromide Guanidine, N,N'''-(dithiodi-2,1-ethanediyl)bis-, dihydrobromide Guanylcystamine dihydrobromide N,N'''-(Dithiodi-2,1-ethanediyl)bisguanidine dihydrobromide