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