InChI=1S/C13H16O8/c14-5-8-9(16)10(17)11(18)13(20-8)21-12(19)6-1-3-7(15)4-2-6/h1-4,8-11,13-18H,5H2/t8-,9-,10+,11-,13+/m1/s1