The molecule is a sesterterpenoid that is ophiobolane with a hydroxy group at position 3, oxo groups at positions 5 and 25, double bonds at positions 7-8 and 19-20, and an oxygen link between positions 14 and 18. It is an oxaspiro compound, an enal, a cyclic ketone, a tertiary alcohol and a sesterterpenoid. It derives from a hydride of an ophiobolane.
(1'R,2S,3S,3'S,4'R,5R,7'S,8'E,11'R)-4'-hydroxy-1',3,4'-trimethyl-5-(2-methylprop-1-enyl)-6'-oxospiro[oxolane-2,12'-tricyclo[9.3.0.03,7]tetradec-8-ene]-8'-carbaldehyde