4-Nitro-3-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-5-sulfonamide
3-Nitro-5-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-4-sulfonamide
3-Nitro-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-5-sulfonamide
2-(Difluoromethyl)-4-nitro-3-(trifluoromethoxy)pyridine-5-acetic acid