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/h2,4,7-10,12,16-18H,1,3H2,(H,13,14)(H,19,20)/b4-2+