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