InChI=1S/C13H16N2O5S/c16-11(17)6-14-12(18)10(8-21)15-13(19)20-7-9-4-2-1-3-5-9/h1-5,10,21H,6-8H2,(H,14,18)(H,15,19)(H,16,17)/t10-/m0/s1