InChI=1S/C13H16N2O4S/c1-7(16)14-9-3-4-12(18)10(5-9)13(19)11(6-20)15-8(2)17/h3-5,11,18,20H,6H2,1-2H3,(H,14,16)(H,15,17)/t11-/m0/s1