InChI=1S/C17H18O8S/c1-9-15(19)10(2)17(21)14(16(9)20)13(18)7-6-11-4-3-5-12(8-11)25-26(22,23)24/h3-5,8,19-21H,6-7H2,1-2H3,(H,22,23,24)