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