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Part-IResults and DiscussionS. No. Y Mol. Formula(Sol. ofrecryst.)IIIxxxiiSH C 19 H 14 N 4 O 2 S 2(C-M)M.P ( o C) IR (cm -1 )(KBr)155-158 2916(γ C-H ),1663(γ CONH ),736(γ C-S )Mass(m/e)NMR (δppm)(DMSO-d 6 )-- --OIIIxxxiiiSOCH 3 C 20 H 16 N 4 O 3 S 2(C-M)115-120 2923(γ C-H ),1669(γ CONH ),738(γ C-S )-- --OIIIxxxivSNNH C 20 H 16 N 6 OS 2(C-M)240-242 2922(γ C-H ),1691(γ CONH ),739(γ C-S )-- --IIIxxxvSNNOCH 3 C 21 H 18 N 6 O 2 S 2(C-M)82-85 3123(γ C-H ),1685(γ CONH ),1589(γ C-C ),758(γ C-S )450(M + ),417,272, 180--91