3-(Difluoromethyl)-6-iodopyridine-2-carboxaldehyde
2-(Bromomethyl)-6-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
4-(Difluoromethyl)-5-iodopyridine-2-carboxaldehyde
3-(Bromomethyl)-6-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-2-sulfonyl chloride