Showing structure for 9,17-bis(acetyloxy)-8-(furan-3-yl)-12-hydroxy-1,9,11,16-tetramethyl-5,14,21-trioxahexacyclo[11.6.1.1⁴,¹⁰.0²,¹¹.0⁶,¹⁰.0¹⁶,²⁰]henicosan-19-yl 2-methylbut-2-enoate