Methyl 5-chloro-4-nitro-2-(trifluoromethoxy)pyridine-3-carboxylate
3-(Chloromethyl)-4-cyano-6-nitro-2-(trifluoromethoxy)pyridine
4-(Chloromethyl)-2-cyano-5-nitro-3-(trifluoromethoxy)pyridine
2-(Chloromethyl)-6-cyano-5-nitro-3-(trifluoromethoxy)pyridine