2-Amino-5-(difluoromethyl)-4-nitropyridine-3-carboxylic acid
6-Amino-4-(difluoromethyl)-2-nitropyridine-3-carboxylic acid
4-Amino-6-(difluoromethyl)-2-iodo-3-(trifluoromethyl)pyridine
2-Amino-4-(difluoromethyl)-3-nitropyridine-5-carboxylic acid
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