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