InChI=1S/C19H20O10/c20-7-2-1-4-9-8-11-10(18(26)27-9)5-3-6-12(11)28-19-15(23)13(21)14(22)16(29-19)17(24)25/h1,3-6,8,13-16,19-23H,2,7H2,(H,24,25)/b4-1+