InChI=1S/C20H18N2O10/c23-13-5-1-3-9(15(13)25)18-22-11(7-31-18)17(27)21-12(19(28)29)8-32-20(30)10-4-2-6-14(24)16(10)26/h1-6,11-12,23-26H,7-8H2,(H,21,27)(H,28,29)/t11-,12-/m0/s1