InChI=1S/C17H20O8/c1-2-10(18)6-3-9-4-7-11(8-5-9)24-17-14(21)12(19)13(20)15(25-17)16(22)23/h3-8,12-15,17,19-21H,2H2,1H3,(H,22,23)/b6-3+