InChI=1S/C18H20N2O9S2/c1-27-20-9-5-7(28-15-12(23)10(21)11(22)13(29-15)14(24)25)3-4-8(9)18(16(20)26)6-19-17(30-2)31-18/h3-5,10-13,15,21-23H,6H2,1-2H3,(H,24,25)