InChI=1S/C13H25NO9S2/c1-2-3-4-5-6-9(14-23-25(19,20)21)24-13-12(18)11(17)10(16)8(7-15)22-13/h8,10-13,15-18H,2-7H2,1H3,(H,19,20,21)/b14-9+