Methyl 3-cyano-2-(difluoromethyl)-5-hydroxypyridine-6-carboxylate
Methyl 2-cyano-6-(difluoromethyl)-3-hydroxypyridine-4-carboxylate
2-(Chloromethyl)-5-cyano-4-(difluoromethyl)-3-methoxypyridine
5-(Bromomethyl)-2-cyano-4-(difluoromethyl)-3-methoxypyridine