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