The structure determination of a new cembranolide diterpene from the soft coral Lobophytum cristigalli (Coelenterata, Octocorallia, Alcyonacea)

Abstract

A specimen of Lobophytum cristigalli collected in Sri Lanka afforded two cembranolide diterpenes (7E,11E,1R,2S,3R,4R,14S)-14-acetoxy-3,4-epoxycembra-7,11,15-trien-17,2-olide (6)* and the corresponding alcohol (7). Their structures were deduced spectroscopically and detailed stereochemistry of (6) was determined by X-ray crystallography.