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