InChI=1S/C14H20O11/c15-7(16)4-2-1-3-6(5-8(17)18)24-14-11(21)9(19)10(20)12(25-14)13(22)23/h2,4,6,9-12,14,19-21H,1,3,5H2,(H,15,16)(H,17,18)(H,22,23)/b4-2+