Showing structure for 18-(acetyloxy)-6-(furan-3-yl)-13-hydroxy-1,5,12,17-tetramethyl-8-oxo-7,10,15-trioxahexacyclo[12.6.1.0²,¹².0⁵,¹¹.0⁹,¹¹.0¹⁷,²¹]henicosan-20-yl 2-methylbut-2-enoate