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