InChI=1S/C19H22N2O9S2/c1-28-21-11-5-4-8(6-9(11)10(16(21)25)7-20-19(31-2)32-3)29-18-14(24)12(22)13(23)15(30-18)17(26)27/h4-7,12-15,18,22-24H,1-3H3,(H,26,27)/b10-7-