InChI=1S/C19H20O10/c1-2-3-4-9-7-10-11(18(26)27-9)5-8(20)6-12(10)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+