4-(Chloromethyl)-6-(difluoromethyl)-2-methoxypyridine-3-carboxaldehyde
3-(Difluoromethyl)-2-methoxy-4-(trifluoromethoxy)pyridine
5-Iodo-4-(trifluoromethoxy)pyridine-2-carboxaldehyde
5-(Chloromethyl)-3-(difluoromethyl)-2-methoxypyridine-4-carboxaldehyde