Sordarin Diterpene Glycosides with an Unusual 1,3-Dioxolan-4-one Ring from the Zoanthid-Derived Fungus TA26-15.

Six new sordarin tetracyclic diterpene glycosides, moriniafungins B-G (-), and a new sordaricin tetracyclic diterpene, sordaricin B (), together with two known analogues, moriniafungin () and sordaricin (), were isolated from the zoanthid-derived fungus TA26-15. The structures of the new compounds were elucidated by comprehensive analyses of spectroscopic data, including 1D and 2D NMR and MS data. Compounds - represent the first case of sordarins from marine-derived fungi possessing a sordarose with a spiro 1,3-dioxolan-4-one ring, which is rare in the nature.

Antiviral C-25 epimers of 26-acetoxy steroids from the South China Sea gorgonian Echinogorgia rebekka.

Four new steroids with an acetoxy linked at the end of the side chain, echrebsteroids A-D (1-4) were obtained from the South China Sea gorgonian Echinogorgia rebekka. The absolute configurations of 1-3 were determined using the modified Mosher's method on the hydrolysis products. The isolation of the pair of epimers (2 and 3) represents the first reported separation of C-25 epimers of 26-acetoxy steroids.

New cembranoid diterpene from the South China Sea soft coral Sarcophyton sp.

One new oxygenated cembranoid diterpene, named sarcophytol W (1), along with six known analogues (2-7) were isolated from a soft coral Sarcophyton sp. collected from the South China Sea. Their structures were elucidated by spectroscopic analyses and by comparison with previously reported data.