5-Amino-2-cyano-3-(difluoromethyl)-4-nitropyridine
4-Amino-5-(difluoromethyl)-2-iodo-3-nitropyridine
4-Amino-3-(difluoromethyl)-5-iodo-2-nitropyridine
4-Amino-6-(difluoromethyl)-2-iodo-3-nitropyridine
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