InChI=1S/C12H16O10/c1-4(2-5(13)14)3-6(15)21-12-9(18)7(16)8(17)10(22-12)11(19)20/h2,7-10,12,16-18H,3H2,1H3,(H,13,14)(H,19,20)/b4-2+