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