InChI=1S/C13H23NO9S2/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/h2,8,10-13,15-18H,1,3-7H2,(H,19,20,21)/b14-9+