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