Further syphonosides from the sea hare Syphonota geographica and the sea-grass Halophila stipulacea |
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Authors: | Marianna Carbone Ernesto Mollo Vassilios Roussis |
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Institution: | a Istituto di Chimica Biomolecolare, CNR, Via Campi Flegrei 34, 80078 Pozzuoli, Naples, Italy b Department of Pharmacognosy and Chemistry of Natural Products, School of Pharmacy, University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece |
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Abstract: | The unusual structural features of syphonoside (1), recently reported from the marine mollusc Syphonota geographica and its prey Halophila stipulacea, stimulated further investigations on the minor secondary metabolites of both organisms. The three novel macrocyclic glycoterpenoids 2-4, structurally related to the main co-occurring metabolite 1, have been isolated and chemically characterized mainly by NMR spectroscopic techniques and degradation methods. Compounds 2 and 3 were found only in the mollusc whereas compound 4 was isolated in trace quantities exclusively from the sea-grass. |
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Keywords: | Marine natural products Halophila stipulacea Syphonota geographica Molluscs Macrocycles Glycoterpenoids |
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