InChI=1S/C16H16O8S/c1-2-3-8-4-5-9(25-8)6-7-10(17)23-16-13(20)11(18)12(19)14(24-16)15(21)22/h4-7,11-14,16,18-20H,1H3,(H,21,22)/b7-6-