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