Ethyl 2-(difluoromethyl)-6-hydroxy-3-nitropyridine-4-carboxylate
Ethyl 2-(difluoromethyl)-3-hydroxy-4-nitropyridine-5-carboxylate
3-(Difluoromethyl)-6-hydroxy-4-nitropyridine-2-acetic acid
4-(Difluoromethyl)-3-hydroxy-2-nitropyridine-5-acetic acid
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