Showing structure for {6,18,19-trihydroxy-10,14-dioxo-9,15-dioxa-12-azapentacyclo[11.8.0.0²,¹¹.0³,⁸.0¹⁶,²¹]henicosa-1(13),2(11),3(8),4,6,16(21),17,19-octaen-5-yl}oxidanesulfonic acid