InChI=1S/C17H16O8S/c1-8-15(19)9(2)17-14(16(8)20)12(18)7-13(24-17)10-4-3-5-11(6-10)25-26(21,22)23/h3-6,13,19-20H,7H2,1-2H3,(H,21,22,23)