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