Showing structure for 14-hydroxy-18,19-dimethoxy-13,14-dimethyl-20-oxo-3,6,8,22-tetraoxahexacyclo[9.9.1.1¹²,¹⁶.0¹,¹⁶.0⁴,²¹.0⁵,⁹]docosa-4,9,11(21),18-tetraen-15-yl 2-methylbut-2-enoate