InChI=1S/C12H23NO9S2/c1-2-3-4-5-8(13-22-24(18,19)20)23-12-11(17)10(16)9(15)7(6-14)21-12/h7,9-12,14-17H,2-6H2,1H3,(H,18,19,20)/b13-8+