Showing structure for (1s,12s,13r,14r)-18,19-dimethoxy-13,14-dimethyl-20-oxo-3,6,8-trioxapentacyclo[9.9.1.0¹,¹⁶.0⁴,²¹.0⁵,⁹]henicosa-4(21),5(9),10,16,18-pentaen-12-yl (2z)-2-methylbut-2-enoate