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