InChI=1S/C16H22O9/c1-9(7-5-3-2-4-6-8-10(17)18)24-16-13(21)11(19)12(20)14(25-16)15(22)23/h2,4-9,11-14,16,19-21H,3H2,1H3,(H,17,18)(H,22,23)/b4-2-,7-5-,8-6+