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