Abstract
Three novel tetraphenolic bis-spiroketals, prunolides A-C (1, 3, and 4) have been isolated from the Australian ascidian Synoicum prunum. The structures were determined from NMR spectroscopic data and from an X-ray analysis of prunolide A. The prunolides contain a unique 1,6,8-trioxadispiro[4.1.4.2]trideca-3,10,12-triene-2,9-dione carbon skeleton. The known compound rubrolide A (5) was also isolated.
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