Showing structure for 4-[11,15-dihydroxy-16-methoxy-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(12),5(9),10-trien-18-yl]-2-methylbut-2-enoic acid