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