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