4-Amino-3-cyano-2-(difluoromethyl)-6-nitropyridine
2-Amino-4-(bromomethyl)-3-(difluoromethyl)-6-iodopyridine
4-Amino-2-cyano-6-(difluoromethyl)-3-nitropyridine
2-Amino-3-(bromomethyl)-6-(difluoromethyl)-4-iodopyridine
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