Ethyl 6-(difluoromethyl)-2-methyl-4-nitropyridine-3-acetate
Ethyl 5-(difluoromethyl)-3-methoxy-4-nitropyridine-2-carboxylate
Ethyl 2-(difluoromethyl)-6-methyl-3-nitropyridine-5-acetate
Ethyl 2-(difluoromethyl)-5-methyl-6-nitropyridine-3-acetate
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