Showing structure for 4,10,15-trihydroxy-13-methyl-12-[(3-methylbut-2-en-1-yl)oxy]-7-(3-methylbut-3-en-1-yl)-9-oxatricyclo[9.4.0.0³,⁸]pentadeca-1(15),3(8),4,6,11,13-hexaen-2-one