Showing structure for 13-(acetyloxy)-5-methoxy-4,7,12-trimethyl-9,15-dioxo-2,10,16-trioxatetracyclo[9.7.0.0³,⁸.0¹⁴,¹⁸]octadeca-1(11),3,5,7,12,14(18)-hexaen-17-yl acetate