Showing structure for 9,17,19-trihydroxy-5,13-bis(4-hydroxyphenyl)-4,12,14-trioxapentacyclo[11.8.0.0²,¹¹.0³,⁸.0¹⁵,²⁰]henicosa-2,8,10,15,17,19-hexaen-21-one