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