InChI=1S/C16H16O8S/c1-22-10-4-2-9(3-5-10)12-8-23-16-11(6-7-13(17)14(16)18)15(12)24-25(19,20)21/h2-7,12,15,17-18H,8H2,1H3,(H,19,20,21)