4-羟基-2-吡啶羧酸;4-羟基吡啶羧酸;4羟基2吡啶甲酸;4-羟基吡啶-2-甲酸;
4-oxo-1H-pyridine-2-carboxylic acid;4-Hydroxypyridine-2-carboxylic acid;
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