N. Shoji et al., 4 NOVEL DITERPENOIDS, INCLUDING NAKAMUROL-A WITH A UNIQUE THELEPOGANESKELETON, FROM THE MARINE SPONGE AGELAS-NAKAMURAI, Journal of natural products, 59(4), 1996, pp. 448-450
Nakamurols A-D (1-4) have been isolated from the Okinawan sponge Agela
s nakamurai Hoshino. The structures of 1-4 were proposed on the basis
of extensive NMR experiments. Nakamurol A is the first non-alkaloid di
terpene with the thelepogane skeleton.