InChI=1S/C17H20O9/c1-25-13-6-9(2-4-10(13)18)3-5-14(21)26-17(16(23)24)7-11(19)15(22)12(20)8-17/h2-6,11-12,15,18-20,22H,7-8H2,1H3,(H,23,24)/b5-3+/t11?,12?,15?,17-