Showing structure for (6e,10e,19e)-7,11,19-trimethyl-16-(prop-1-en-2-yl)-24,26-dioxapentacyclo[13.7.2.1²,¹³.1³,¹³.0¹,¹⁴]hexacosa-3(25),6,10,19-tetraen-23-one