MINOR AND TRACE STEROLS IN MARINE INVERTEBRATES 30. ISOLATION, STRUCTURE ELUCIDATION AND PARTIAL SYNTHESIS OF 26-METHYLSTRONGYLOSTEROL AND 28-METHYLXESTOSTEROL - TWO MARINE STEROLS ARISING BY A NOVEL QUADRUPLE BIOMETHYLATION SEQUENCE

Article abstract of DOI:10.1016/S0040-4039(01)83001-X

Two new sterols, 26-methylstrongylosterol (4) and 28-methylxestosterol (5), arising from a hitherto unknown quadruple biomethylation sequence, together with the biogenetically important "missing link", durissimasterol (6), were isolated from the Indo-Pacific sponge Strongylophora durissima.