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.
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Williams et al. (1988) studied this question.
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