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Depigmenting properties of tyrosinase inhibitors (TAi) boosted the search for new compounds applicable in cosmetics. Kojic acid, a 3-hydroxy-4-pyrone, is the most studied tyrosinase inhibitor but undesirable side effects, like dermatitis, and unspecified mechanism led to its exclusion in several countries. To discover safer and more efficient TA, we evaluated tyrosinase inhibitory effect of twelve 3-hydroxy-4-pyridinones (3,4-HPO) in vitro and considering the two reaction steps of inhibition in mushroom tyrosinase enzyme. In parallel we