InChI=1S/C20H17NO9/c1-28-13-6-10(22)7-14-16(13)17(26)19(29-2)18(30-14)9-3-4-11(12(23)5-9)20(27)21-8-15(24)25/h3-7,22-23H,8H2,1-2H3,(H,21,27)(H,24,25)