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