Showing structure for (4r,8r)-2,18-dihydroxy-4-methoxy-7,9,13-trioxapentacyclo[10.8.0.0³,¹⁰.0⁴,⁸.0¹⁴,¹⁹]icosa-1,3(10),5,11,14,16,18-heptaen-20-one