Showing structure for (2r,6'ar,8's,9'r,10'ar,10'br)-3,7',7',10'a-tetramethyl-8'-{[(2z)-2-methylbut-2-enoyl]oxy}-5-oxo-1',4',6',6'a,8',9',10',10'b-octahydrospiro[furan-2,2'-naphtho[2,1-c]pyran]-9'-yl (2z)-2-methylbut-2-enoate