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