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