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