InChI=1S/C19H20O10/c1-2-3-4-8-7-10-9(18(26)27-8)5-6-11(12(10)20)28-19-15(23)13(21)14(22)16(29-19)17(24)25/h3-7,13-16,19-23H,2H2,1H3,(H,24,25)/b4-3+