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