Showing structure for (3s,5ar,5br,7ar,8s,11as,11br,13as)-8-ethyl-3,5b,8,11a,13a-pentamethyl-3h,4h,5h,5ah,6h,7h,7ah,9h,10h,11h,11bh,12h-chryseno[1,2-c]furan-1,13-dione