InChI=1S/C12H16O10/c13-5(14)3-1-2-4-6(15)21-12-9(18)7(16)8(17)10(22-12)11(19)20/h1-2,7-10,12,16-18H,3-4H2,(H,13,14)(H,19,20)/b2-1+