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