InChI=1/C14H14N2O4S/c1-21(19,20)11-6-4-10(5-7-11)16-14(18)12(8-15)13(17)9-2-3-9/h4-7,9,16,18H,2-3H2,1H3/p-1/b14-12-/fC14H13N2O4S/h18h/q-1 346676168104608D