Showing structure for (1s,13s,18s,19r)-9,14,18-trimethyl-13-(3-methylbutanoyl)-4,12,20-trioxapentacyclo[11.6.1.0²,¹¹.0⁵,¹⁰.0¹⁵,¹⁹]icosa-2(11),5,7,9,14-pentaen-3-one