The molecule is a diterpene that consists of a labdane skeleton with double bonds at C-8(17), C-12(13) and C-14 (the Z-isomer) and inversion of stereochemistry at the 5, 9 and 10 positions. It derives from a hydride of a labdane.
(4aR,8R,8aR)-4,4,8a-trimethyl-7-methylidene-8-[(2Z)-3-methylpenta-2,4-dienyl]-2,3,4a,5,6,8-hexahydro-1H-naphthalene