Showing structure for (1r,5s,13r)-1,9,17,19-tetrahydroxy-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