Showing structure for [8,17,18-trihydroxy-7-(hydroxymethyl)-2,11,14-trioxo-5-(3,4,5-trihydroxybenzoyloxy)-3,6,10,15-tetraoxatetracyclo[11.6.1.0⁴,⁹.0¹⁶,²⁰]icosa-1(19),16(20),17-trien-12-yl]acetic acid