InChI=1S/C17H20O10/c1-24-9-5-3-8(4-6-11(18)25-2)10(7-9)26-17-14(21)12(19)13(20)15(27-17)16(22)23/h3-7,12-15,17,19-21H,1-2H3,(H,22,23)/b6-4+