A new pimarane diterpenoid from the Botryotinia fuckeliana fungus isolated from deep-sea water.

A new pimarane diterpenoid, named botryopimarene A (1), was discovered from the fungus Botryotinia fuckeliana MCCC 3 A00494 isolated from the deep-sea water, together with ten known compounds. The planar structure of 1 was established based on the extensive spectroscopic analyses. The absolute configurations of tricyclic system in 1 were resolved by the theoretical ECD calculation, while the 15,16-diol moiety in the side chain was resolved by the Mo-2(OAc)(4)-induced ECD spectrum. Compound 1, featuring a Delta(9(11)) double bond, was rarely discovered in pimarane family. Compounds 1-11 were tested for their cytotoxic activities using six human cancer cell lines by the MTT method. However, none of the compounds exhibited detectable cytotoxicities (IC50 >20 mu m).