InChI=1S/C13H18N2O5S/c14-9-1-2-10-15-13(16)8-5-11-3-6-12(7-4-11)20-21(17,18)19/h3-8H,1-2,9-10,14H2,(H,15,16)(H,17,18,19)/b8-5+