Showing structure for 7-{2-[8-(1-hydroxy-2-methylbut-2-en-1-yl)-2,4,6,8-tetramethylbicyclo[4.2.0]octa-2,4-dien-7-yl]prop-1-en-1-yl}-4,6,7-trimethyl-2-oxabicyclo[2.2.1]heptane-3,5-dione