Showing structure for [16,17,20-trihydroxy-7-(hydroxymethyl)-2,10,13-trioxo-5-(3,4,5-trihydroxybenzoyloxy)-3,6,9,14-tetraoxatetracyclo[10.6.1.1⁴,⁸.0¹⁵,¹⁹]icosa-1(18),15(19),16-trien-11-yl]acetic acid