InChI=1S/C13H18N2O6S/c14-7-1-2-8-15-13(17)12(16)9-10-3-5-11(6-4-10)21-22(18,19)20/h3-6,9,16H,1-2,7-8,14H2,(H,15,17)(H,18,19,20)/b12-9-