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