InChI=1S/C20H20N2O9/c1-28-13-5-3-9-7-10(19(26)30-15(9)16(13)29-2)21-18(25)11-8-20(27)14(24)6-4-12(23)17(20)31-22-11/h3-7,12,14,17,23-24,27H,8H2,1-2H3,(H,21,25)/t12-,14-,17+,20+/m1/s1