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