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