Structurally Diverse Terpenoids from the Sea Whip Pseudopterogorgia elisabethae (Bayer)

The extraction of a specimen of Pseudopterogorgia elisabethae from Colombia afforded three new diterpenes 1–3, a norditerpene 4, and a tetrisnorditerpene 5. Metabolites 4 and 5 contain unusual carbon skeletons that are previously undescribed and therefore constitute new classes of C19 and C16 rearranged terpenes, respectively. Full details of the isolation and structure elucidation of 1–5, which were established by spectroscopic methods including comprehensive 2D NMR measurements, are provided herein.