InChI=1S/C19H20O10/c1-8-7-11-10(3-4-12(20)27-11)16(9(8)5-6-26-2)28-19-15(23)13(21)14(22)17(29-19)18(24)25/h3-7,13-15,17,19,21-23H,1-2H3,(H,24,25)/b6-5+