3-Amino-2-(difluoromethyl)-5-nitropyridine-6-carboxylic acid
6-Amino-2-(difluoromethyl)-4-nitropyridine-3-carboxylic acid
2-Amino-4-(difluoromethyl)-3-nitropyridine-6-carboxylic acid
4-Amino-3-(difluoromethyl)-2-nitropyridine-6-acetic acid
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