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