4-(Difluoromethyl)-6-nitro-3-(trifluoromethoxy)pyridine-2-carboxylic acid
5-(Difluoromethyl)-3-nitro-4-(trifluoromethoxy)pyridine-2-carboxylic acid
2-(Bromomethyl)-6-(difluoromethyl)-5-(trifluoromethoxy)pyridine-3-carboxaldehyde
5-(Difluoromethyl)-3-nitro-2-(trifluoromethoxy)pyridine-4-carboxylic acid