Four new brominated diterpenes possessing parguerane or isoparguerane skeleton have been isolated from the title alga collected in the Japanese waters along with several known parguerol, isoparguerol, and deoxyparguerol congeners. The structures of three new compounds were determined by the chemical correlation with the corresponding known compounds. The structural elucidation of the remaining one was carried out on the basis ...
![(1aS,1bS,3R,3aR,5S,7bR,9R,9aR)-1a-(hydroxymethyl)-5,7b-dimethyl-5-((S)-oxiran-2-yl)-1a,1b,2,3,3a,4,5,6,7b,8,9,9a-dodecahydro-1H-cyclopropa[a]phenanthrene-3,9-diyl diacetate结构式](https://image.chemsrc.com/caspic/105/113866-73-2.png)
![(1aS,1bS,3R,3aR,5S,7bR,9R,9aR)-5-((R)-1-bromo-2-hydroxyethyl)-1a-(hydroxymethyl)-5,7b-dimethyl-1a,1b,2,3,3a,4,5,6,7b,8,9,9a-dodecahydro-1H-cyclopropa[a]phenanthrene-3,9-diyl diacetate结构式](https://image.chemsrc.com/caspic/084/113866-69-6.png)