Sj. Rochfort et al., HIPPOSPONGINS A-F - NEW FURANOTERPENES FROM A SOUTHERN AUSTRALIAN MARINE SPONGE HIPPOSPONGIA SP, Journal of natural products, 59(11), 1996, pp. 1024-1028
Three new C-25 furanoterpenes, hippospongins A-C (5-7); a new C-24 fur
anoterpene, hippospongin D (8); and two new C-22 furanoterpenes, hippo
spongins E and F (9 and 10), were isolated from a southern Australian
collection of the marine sponge Hippospongia sp. The hippospongins pos
sess structural features intermediate between C-21 furanoterpenes and
their putative biosynthetic precursors, C-25 tetronic acids. All struc
tures were secured by detailed spectroscopic analysis.