Abstract
Xestosterol, a triply alkylated marine sponge sterol, with a symmetrically extended side chain is shown to be efficiently biosynthesized by the sponge Xestospongia testudinaria via a nonstereoselective SAM biomethylation and 1,2-hydrogen shift. De novo biosynthesis via mevalonate, rarely demonstrated in sponges, has also been demonstrated.
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