1,1',3,3',5,5',6,6'-octamethyl-2,2'-spirobi[benzimidazole];99643-38-6;1,1'3,3',5,5'6,6'-Octamethyl-2,2'-spiro(2,3-dihydro-1H-benzimidazole;1,1'3,3',5,5'6,6'-Octamethyl-2,2'-spiro[2,3-dihydro-1H-benzimidazole
1,1',3,3',5,5',6,6'-octamethyl-2,2'-spirobi[benzimidazole]