Hydroazulenoid diterpenes from the brown alga dictyota dichotoma var. Implexa

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Together with the previously described pachydictyol A and dictyol B acetate, a new hydroazulenoid diterpene, dictyol I acetate, was isolated from the brown alga Dictyota dichotoma var. implexa obtained from the Northern Adriatic sea. The structure of the new diterpenoid was proposed on the basis of its spectral data, in comparison with known related compounds. The use of 2D-NMR spectroscopy allowed us to establish its relative stereochemistry and to correct some 1H NMR data previously reported. The difference in secondary metabolises between the same alga collected in the Northern Adriatic sea and the Tyrrhenian sea are shown.