InChI=1S/C21H20N2O8/c1-6-7-4-3-5-8(24)10(7)15(25)11-9(6)16(26)13-14(23-2)17(27)12(20(22)30)19(29)21(13,31)18(11)28/h3-5,9,12-14,16,23-24,26,28,31H,1H2,2H3,(H2,22,30)/t9?,12?,13?,14?,16?,21-/m0/s1