InChI=1S/C14H20O11/c15-7(16)3-1-2-6(4-5-8(17)18)24-14-11(21)9(19)10(20)12(25-14)13(22)23/h4-6,9-12,14,19-21H,1-3H2,(H,15,16)(H,17,18)(H,22,23)/b5-4+