Showing structure for (2z)-4-[(1s,2s,7r,14r,15r,16r,18r)-11-hydroxy-15,16-dimethoxy-6,6,7,20,20-pentamethyl-10-(3-methylbut-2-en-1-yl)-13,17-dioxo-3,8,19-trioxahexacyclo[14.4.1.0²,¹⁴.0²,¹⁸.0⁴,¹².0⁵,⁹]henicosa-4,9,11-trien-18-yl]-2-methylbut-2-enoic acid