InChI=1S/C13H18N2O8S/c1-22-9-4-2-8(3-5-9)7-15-11(16)6-10(12(14)13(17)18)23-24(19,20)21/h2-5,10,12H,6-7,14H2,1H3,(H,15,16)(H,17,18)(H,19,20,21)