2-Chloro-3-(chloromethyl)-5-nitro-4-(trifluoromethoxy)pyridine
3-Chloro-2-(fluoromethyl)-6-nitro-5-(trifluoromethoxy)pyridine
6-Chloro-2-(fluoromethyl)-3-nitro-4-(trifluoromethoxy)pyridine
2-Chloro-5-(fluoromethyl)-4-nitro-3-(trifluoromethoxy)pyridine