1985 Volume 33 Issue 3 Pages 1305-1308
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).