InChI=1S/C21H20N2O8/c1-23(2)10-3-4-11(24)13-8(10)5-7-6-9-15(25)17(27)14(20(22)30)19(29)21(9,31)18(28)12(7)16(13)26/h3-4,7,9,24,27-28,31H,5-6H2,1-2H3,(H2,22,30)/t7-,9-,21-/m0/s1