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