Showing structure for (1r,2r,4r,6s,8s,9s,10s,11s,12s,13r,16r,17r,19s)-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 (2e)-2-methylbut-2-enoate