Showing structure for 3-hydroxy-4,6,7,15,17,18-hexamethyl-8,11,19-trioxapentacyclo[10.7.1.0²,¹⁰.0⁵,⁹.0¹⁶,²⁰]icosa-1(20),2(10),3,5(9),6,12,15-heptaen-14-one