Caribenols A and B, Sea Whip Derived Norditerpenes with Novel Tricarbocyclic Skeletons

The extraction of two specimens of Pseudopterogorgia
elisabethae, each collected from a different location at the
San Andrés Archipelago, afforded two new norditerpenes,
caribenols A (1) and B (2). Metabolites 1 and 2 contain
unusual carbon skeletons that are previously undescribed and
therefore constitute new classes of C19 rearranged terpenes.
Their molecular structures were established by a combination
of single-crystal X-ray analysis and comprehensive 2D NMR
measurements.