Methyl 3-(difluoromethyl)-2-nitro-5-(trifluoromethyl)pyridine-4-carboxylate
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