InChI=1S/C13H25NO9S2/c1-7(2)4-3-5-9(14-23-25(19,20)21)24-13-12(18)11(17)10(16)8(6-15)22-13/h7-8,10-13,15-18H,3-6H2,1-2H3,(H,19,20,21)/b14-9+