Showing structure for (1s,2s,3r,9r,10s)-3,9-bis(3,4-dihydroxyphenyl)-2,13,15-trihydroxy-4-oxatetracyclo[8.6.1.0⁵,¹⁷.0¹¹,¹⁶]heptadeca-5,11,13,15-tetraen-7-one