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New oxygenated sesquiterpenes from the Indonesian soft coral Nephthea chabrolii

Handayani, D. and Edrada, R. A. and Proksch, P. and Wray, V. and Witte, L. and Van Ofwegen, L. and Kunzmann, A. (1997) New oxygenated sesquiterpenes from the Indonesian soft coral Nephthea chabrolii. Journal of Natural Products, 60 (7). pp. 716-718. ISSN 0163-3864

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The Indonesian soft coral Nephthea chabrolii afforded two new oxygenated sesquiterpenes: hydroxycolorenone (1) and methexycolorenone (2), as well as the known liverwort metabolite (+)-cyclocolorenone (3). This is the first report of the occurrence of such terrestrial liverwort metabolites in marine soft corals. The structures of the new compounds were unambiguously established on the basis of NMR spectroscopic data ( 1H, 13C, COSY, 1H- detected direct and long-range 13C- 1H correlations). Compound 1 exhibited insecticidal activity towards neonate larvae of the polyphagous pest insect Spodoptera littoralis, with an EC 50 of 8.8 ppm and a LC 50 of 453 ppm, when incorporated in artificial diet and offered to larvae in a chronic feeding bioassay.