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