Ethyl 2-amino-3-(difluoromethyl)-4-nitropyridine-5-acetate
4-Amino-2-(difluoromethyl)-5-nitro-3-(trifluoromethyl)pyridine
Methyl 4-amino-5-(difluoromethyl)-3-nitropyridine-2-acetate
4-Amino-3-(bromomethyl)-2-(difluoromethyl)-6-iodopyridine
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