Ethyl 2-amino-5-(difluoromethyl)-3-nitropyridine-6-acetate
Ethyl 2-amino-4-(difluoromethyl)-3-nitropyridine-6-acetate
Methyl 3-amino-6-(difluoromethyl)-2-nitropyridine-5-acetate
4-Amino-2-(difluoromethyl)-3-iodopyridine-6-acetic acid
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