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