Abstract
We report on the spontaneous, reversible intramolecular transesterification of natural labdane lactones. Through extensive spectroscopic analysis, the interconversion between the two tautomers was investigated, which could be retarded when the free hydroxy group was acetylated or the exocyclic double bond of the lactone ring was mutated. Besides, a conversion mechanism was postulated, and the energy barriers were calculated by density functional theory calculations. Furthermore, the tautomers were found to inhibit the virulence of the efflux pump-deficient Candida albicans DSY654.
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