InChI=1S/C19H16O9/c20-12-6-10(28-17(19(25)26)16(22)18(23)24)7-13-14(12)15(21)11(8-27-13)9-4-2-1-3-5-9/h1-7,11,16-17,20,22H,8H2,(H,23,24)(H,25,26)