InChI=1S/C19H20O9/c1-2-3-5-9-8-11-10(18(25)26-9)6-4-7-12(11)27-19-15(22)13(20)14(21)16(28-19)17(23)24/h3-8,13-16,19-22H,2H2,1H3,(H,23,24)/b5-3+