InChI=1S/C18H20O9/c1-6-7(2)15(10-8(11(6)20)4-3-5-9(10)19)26-18-14(23)12(21)13(22)16(27-18)17(24)25/h3-5,12-14,16,18-23H,1-2H3,(H,24,25)