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