InChI=1S/C17H22O8S/c1-26-8-9(7-18)6-10-4-2-3-5-11(10)24-17-14(21)12(19)13(20)15(25-17)16(22)23/h2-6,12-15,17-21H,7-8H2,1H3,(H,22,23)/b9-6+