129238-73-9 1H-Benzimidazole, 2-(1,2,2,2-tetrafluoroethyl)- 2-(1,1,2,2-Tetrafluoroethyl)benzimidazole 2-(1,2,2,2-Tetrafluoroethyl)-1H-benzimidazole 2-(alpha-Fluoroethyl)tetrahydrobenzimidazole 2-FETB 2-TFEB 41185-74-4