Three new C 25 furanoterpenes, hippospongins A−C ( 5 − 7 ); a new C 24 furanoterpene, hippospongin D ( 8 ); and two new C 22 furanoterpenes, hippospongins E and F ( 9 and 10 ), were isolated from a southern Australian collection of the marine sponge Hippospongia sp. The hippospongins possess structural features intermediate between C 21 furanoterpenes and their putative biosynthetic precursors, C 25 tetronic acids. All structures were secured by detailed spectroscopic analysis.
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Rochfort et al. (1996) studied this question.
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