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