InChI=1S/C19H20O9/c1-2-3-4-10-7-9-5-6-11(8-12(9)18(25)26-10)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)/b4-3+