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In page Ciclopirox:

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Ciclopirox is a considered a hydroxypyrimidine (sic) antifungal agent. Structurally, ciclopirox is the N-oxide of a 2-hydroxypyridine derivative and therefore ought to be termed a hydroxypyridine antifungal agent. Additionally, the structure as drawn above is the lactam tautomer[clarification needed] and indicates the molecule being an N-Hydroxy-2-pyridone. Hence the classification of ciclopirox as a 2-pyridone antifungal agent.