Ethyl 2-(difluoromethyl)-3-nitro-6-(trifluoromethoxy)pyridine-4-carboxylate
3-Methyl-6-nitro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
Methyl 3-(difluoromethyl)-6-nitro-2-(trifluoromethoxy)pyridine-5-carboxylate
5-Methyl-2-nitro-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride