Naturally occurring didemnaketals: Structural elucidation, features, and pharmacological activities

Didemnaketals are rare terpenoid class reported only in the marine ascidian Didemnum species. They possess important biological activities like HIV-1 protease inhibitor, protein kinase inhibition, antimicrobial, antiproliferative, and cytotoxic. A compilation of new naturally occurring didemnaketals reported during 1991–2014 is provided with available physical and spectral data: mp, [α]D, UV, IR, 1H and 13C NMR as well as biological activities and references.