InChI=1/C14H12N2O4S/c1-8-3-4-11-10(7-8)9(2)14(20-11)21(18,19)13-6-5-12(17)15-16-13/h3-7H,1-2H3,(H,15,17)/p-1/fC14H11N2O4S/q-1 8EF31569F33C3F3D