InChI=1S/C17H20O8S/c1-26-8-10(7-18)5-9-3-2-4-11(6-9)24-17-14(21)12(19)13(20)15(25-17)16(22)23/h2-7,12-15,17,19-21H,8H2,1H3,(H,22,23)/b10-5+