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