Five new pseudopterane diterpenes from the Caribbean sea plume Pseudopterogorgia acerosa Pallas, Gorgonacea.

Five new pseudopteranoid diterpenes, pseudopteradiene (2), pseudopteradienoic acid (3), 11-pseudopteranol (4), pseudopteranoic acid (5), and diepoxygorgiacerodiol (7), along with five previously described analogues, have been isolated from Puerto Rican specimens of the gorgonian octocoral Pseudopterogorgia acerosa. Detailed analysis of the spectral data and chemical methods were used to establish their structures and to define the relative stereochemistry.