Showing structure for methyl 2-[17-(acetyloxy)-9-(furan-3-yl)-10,14,16,16-tetramethyl-7,18-dioxo-3,8-dioxapentacyclo[12.3.1.0²,⁴.0⁴,¹³.0⁵,¹⁰]octadecan-15-yl]acetate