InChI=1S/C17H16O8S/c1-9-15(19)11(8-24-26(21,22)23)17-14(16(9)20)12(18)7-13(25-17)10-5-3-2-4-6-10/h2-6,13,19-20H,7-8H2,1H3,(H,21,22,23)