Ethyl 3-bromo-5-(difluoromethyl)-2-nitropyridine-4-acetate
Ethyl 3-bromo-4-(difluoromethyl)-6-nitropyridine-2-acetate
Ethyl 3-bromo-4-(difluoromethyl)-5-nitropyridine-2-acetate
Ethyl 3-bromo-4-(difluoromethyl)-2-nitropyridine-5-acetate
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