Showing structure for 13-[(1e)-3-hydroxy-3-methylbut-1-en-1-yl]-9,14,18-trimethyl-4,12,20-trioxapentacyclo[11.6.1.0²,¹¹.0⁵,¹⁰.0¹⁵,¹⁹]icosa-2(11),5,7,9-tetraen-3-one