4-(Difluoromethyl)-3-nitro-2-(trifluoromethoxy)pyridine-5-sulfonamide
6-Nitro-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-3-sulfonyl chloride
6-Nitro-3-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-2-sulfonyl chloride
2-Nitro-5-(trifluoromethoxy)-3-(trifluoromethyl)pyridine-4-sulfonyl chloride