InChI=1S/C17H18O8/c1-24-14-6-9(2-4-11(14)18)3-5-15(21)25-16-12(19)7-10(17(22)23)8-13(16)20/h2-7,12-13,16,18-20H,8H2,1H3,(H,22,23)/b5-3+