Methyl 2-(difluoromethyl)-3-nitro-5-(trifluoromethyl)pyridine-6-carboxylate
Methyl 2-(difluoromethyl)-3-nitro-4-(trifluoromethyl)pyridine-6-carboxylate
Methyl 5-(difluoromethyl)-2-nitro-3-(trifluoromethyl)pyridine-6-carboxylate
3-(Difluoromethyl)-6-nitro-2-(trifluoromethyl)pyridine-4-carboxylic acid