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1 - L'énergie lumineuse excite un électron de l'oxygène.2 - Passage de l'électron à l'état excité en forme singulet.3 - Délocalisation des électrons des doubles liaisons = dérivé instable.4 - Elimination de l'acétate5 - Perte d'un proton pour se rééquilibrer : Anhydrorétinol.NB : L'Anhydrorétinol n'a plus d'activité.NB : La désexcitation peut aussi passer par une fluorescence.

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