InChI=1S/C20H21NO9/c1-28-13-5-8(7-22)4-11-10-3-2-9(6-12(10)21-14(11)13)29-20-17(25)15(23)16(24)18(30-20)19(26)27/h2-6,15-18,20-25H,7H2,1H3,(H,26,27)