Showing structure for methyl 4-[(1s,2s,17s,19r)-12-hydroxy-8,8,21,21-tetramethyl-5-(3-methylbut-2-en-1-yl)-14,18-dioxo-3,7,20-trioxahexacyclo[15.4.1.0²,¹⁵.0²,¹⁹.0⁴,¹³.0⁶,¹¹]docosa-4,6(11),9,12-tetraen-19-yl]-2-methylbut-2-enoate