Bipinnapterolide B, a bioactive oxapolycyclic diterpene from the Colombian gorgonian coral Pseudopterogorgia bipinnata

A rare pentacyclic pseudopterane diterpene possessing antitubercular properties has been isolated from the Colombian gorgonian coral Pseudopterogorgia bipinnata. Its molecular structure was elucidated by interpretation of overall spectral data, which included 2D NMR correlation methods, IR, UV, HRESIMS, and X-ray diffraction analysis.