InChI=1S/C12H16O11/c13-4(2-1-3-5(14)15)11(21)23-12-8(18)6(16)7(17)9(22-12)10(19)20/h1-2,4,6-9,12-13,16-18H,3H2,(H,14,15)(H,19,20)/b2-1+