Showing structure for methyl 2-[3,13,14-tris(acetyloxy)-6-(furan-3-yl)-1,5,15,15-tetramethyl-8,17-dioxo-7-oxatetracyclo[11.3.1.0²,¹¹.0⁵,¹⁰]heptadec-11-en-16-yl]acetate