Cytotoxic Squalene-Derived Polyethers from the Marine Red Alga <i>Laurencia obtusa</i> (Hudson) Lamouroux

Abstract

Abstract Five new cytotoxic triterpenoids with squalene carbon skeleton have been isolated from the title alga. The structures of 15(28)-anhydrothyrsiferyl diacetate, 15-anhydrothyrsiferyl diacetate, and magireol-A were confirmed by the spectral and chemical methods. The structures of magireol-B and -C were deduced from the spectral data.