InChI=1S/C13H16O8/c1-5-2-3-6(14)7(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+/m0/s1