Abstract
Abstract A sponge from the Great Barrier Reef is described and placed in a new genus Collospongia of the family Thorectidae, order Dictyoceratida. In addition to the known scalarane sesterterpenes heteronemin, 12- episcalaradial , 12- epiodeacetyl-scalaradial , 12,18- di-epi-scalaradial , 12- epi-deoxoscalarin and 12-acetyl-19,20-dimethoxydeoxoscalarin, the new compounds methyl 18-hydroxy-19-norscalar-16-en-20-carboxylate, 12-deacetylhyrtial, scalarolide acetate and 20-hydroxyscalarolide have been isolated from this new sponge, Collospongia auris .
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