InChI=1S/C13H16O8/c1-5-2-3-7(6(14)4-5)20-13-10(17)8(15)9(16)11(21-13)12(18)19/h2-4,8-11,13-17H,1H3,(H,18,19)/t8-,9?,10?,11-,13+/m1/s1