Ethyl 5-bromo-2-(difluoromethyl)-3-hydroxypyridine-4-acetate
Methyl 3-amino-2-(difluoromethyl)-4-methoxypyridine-6-carboxylate
Methyl 2-amino-6-(difluoromethyl)-3-methoxypyridine-5-carboxylate
Methyl 6-amino-3-(difluoromethyl)-2-methoxypyridine-4-carboxylate