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