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