Showing structure for (6s)-10-hydroxy-16,17-dimethoxy-6-(prop-1-en-2-yl)-2,7,20-trioxapentacyclo[11.8.0.0³,¹¹.0⁴,⁸.0¹⁴,¹⁹]henicosa-1(13),3,8,10,14,16,18-heptaen-12-one