5-Bromo-3-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine
3-Bromo-6-nitro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
3-Bromo-5-(difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine
5-Bromo-2-nitro-4-(trifluoromethoxy)pyridine-3-sulfonyl chloride