InChI=1S/C22H19NO8/c1-29-22(28)18-16(25)8-3-9-17(18)30-10-4-6-13-5-2-7-14(11-13)20-15(12-24)19(21(26)27)23-31-20/h2-9,11,24-25H,10,12H2,1H3,(H,26,27)/b6-4+