Halenaquinol and halenaquinol sulfate, pentacyclic hydroquinones from the Okinawan marine sponge Xestospongia sapra.

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Abstract
Two new pentacyclic hydroquinones named halenaquinol (1) and halenaquinol sulfate (2) were isolated from the okinawan marine sponge Xestospongia sapra and their structures were elucidated on the basis of chemical and physicochemical evidence which included a quantitative photo-oxidative conversion of 1 to halenaquinone (3).

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