InChI=1S/C16H16O8S/c1-8-6-7-9(25-8)4-2-3-5-10(17)23-16-13(20)11(18)12(19)14(24-16)15(21)22/h3,5-7,11-14,16,18-20H,1H3,(H,21,22)/b5-3+