InChI=1/C17H20O9/c1-25-13-6-9(2-4-10(13)18)3-5-14(21)26-15-11(19)7-17(24,16(22)23)8-12(15)20/h2-6,11-12,15,18-20,24H,7-8H2,1H3,(H,22,23)/b5-3+