(R,S)-1-(2,6-Difluorophenyl)-1H,3H-thiazolo[3,4-a]benzimidazole 1-Dfptb 138226-12-7 AIDS-004958 AIDS004958 NSC625487 NSC676948 NSC676949 TBI TBM TBZ TBZ-1 Thiazolobenzimidazole