Minor metabolites of the cold water soft coral Gersemia rubiformis

Abstract
The minor metabolites of both Pacific and Atlantic Ocean specimens of the cold water soft coral Gersemia rubiformis have been investigated. Pacific coast animals yielded two new pseudopterane diterpenoids, isogersemolides A (11) and B (12), and four new cembrane diterpenoids, isoepilophodiones A (13), B (14), and C (15) and rubifol (16). Atlantic coast animals yielded 3-acetoxy-β-cubebene (17). The proposed structures of all the new metabolites are based on spectroscopic analysis and chemical interconversions.