A novel tetranorditerpenoid, sinubatin A (1) (having an unprecedented carbon skeleton), a new norditerpenoid, sinubatin B (2) (a 4,5-epoxycaryophyllene possessing an unusual methylfuran moiety side chain), and a known diterpenoid, gibberosin J (3) were isolated from soft coral Sinulariananolobata. The structures of the new compounds were elucidated by extensive analysis of spectroscopic data.
Keywords: Sinularia nanolobata; cytotoxicity; gibberosin J; norditerpenoid; tetranorditerpenoid.