Nicotinic acid N-oxide is an organic compound with the formula (HO2C)C5H4NO.

It is the N-oxide of nicotinic acid ((HO2C)C5H4N).

It is prepared by oxidation of nicotinic acid or the hydrolysis of 3-cyanopyridine N-oxide.

The compound is a precursor to the popular drugs niflumic acid and pranoprofen.

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