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