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Abstract
Chemical investigation of the liposoluble extract of the gorgonian Acanthogorgia turgida, from Indian coasts, led us to isolate a new xenicane-based norditerpene, isoacalycixeniolide-A (1), along with the known structurally related compounds 2–6. The structure of the norditerpene (1) was elucidated by spectral methods (mainly by NMR techniques), whereas the absolute stereochemistry was suggested by the application of circular dicroism methodology.
Acknowledgements
We acknowledge Mrs D. Ricciardi for her valuable technical assistance. Thanks are also due to the ICB-NMR service and to Mr S. Zambardino of the staff service, to Mr C. Iodice for spectrophotometric measurements and to Mr R. Turco for the drawing support. This work was partially supported by a bilateral CNR (Italy)–CSIR (India) programme. We are grateful to Dr P.A.Thomas (Central Marine Fisheries Research Institute–CMFRI, Vizhijam, Kerala, India) for the identification of A. turgida.