Showing structure for 10-hydroxy-5,5,6,18,18-pentamethyl-16-(3-methylbut-2-en-1-yl)-2,7,17-trioxahexacyclo[14.4.1.0¹,¹³.0³,¹¹.0⁴,⁸.0¹⁵,¹⁹]henicosa-3(11),4(8),9,13-tetraene-12,21-dione