The structures of N,N'-bis(2-methylphenyl)-2,2'-thiodibenzamide, C(28)H(24)N(2)O(2)S, (Ia), N,N'-bis(2-ethylphenyl)-2,2'-thiodibenzamide, C(30)H(28)N(2)O(2)S, (Ib), and N,N'-bis(2-bromophenyl)-2,2'-thiodibenzamide, C(26)H(18)Br(2)N(2)O(2)S, (Ic), are compared with each other. For the 19 atoms of the consistent thiodibenzamide core, the r.m.s. deviations of the molecules in pairs are 0.29, 0.90 and 0.80 Å for (Ia)/(Ib), (Ia)/(Ic) and (Ib)/(Ic), respectively. The conformations of the central parts of molecules (Ia) and (Ib) are similar due to an intramolecular N-H···O hydrogen-bonding interaction. The molecules of (Ia) are further linked into infinite chains along the c axis by intermolecular N-H···O interactions, whereas the molecules of (Ib) are linked into chains along b by an intermolecular N-H···π contact. The conformation of (Ic) is quite different from those of (Ia) and (Ib), since there is no intramolecular N-H···O hydrogen bond, but instead there is a possible intramolecular N-H···Br hydrogen bond. The molecules are linked into chains along c by intermolecular N-H···O hydrogen bonds.
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