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