InChI=1S/C20H19NO9/c1-28-12-7-8(6-10-9-4-2-3-5-11(9)21-13(10)12)19(27)30-20-16(24)14(22)15(23)17(29-20)18(25)26/h2-7,14-17,20-24H,1H3,(H,25,26)