124636-08-4 2-Guanidino-5-aminobenzimidazole dihydrochloride hemihydrate 5-Amino-1H-benzimidazol-2-ylguanidine hydrochloride hydrate Guanidine, 5-amino-1H-benzimidazol-2-yl-, hydrochloride, hydrate (2:4:1)