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