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Synthesis and Antibacterial Activities of Some New Thieno(2,3-b) quinolines.-The title compounds (18 examples) are prepared and tested in vitro for their biological activity, which is supposed to be enhanced compared to that of other quinolines because of an additional thiophene moiety. Among the compounds tested only (IIIa), (V), (VII), (VIII), and (XVI) exhibit antibacterial activities of high order. -(ABDEL-RAHMAN, A. E.; BAKHITE, E. A.; ABDEL-MONEAM, M. I.; MOHAMED, T. A.; Phosphorus, Sulfur Silicon Relat. Elem. 73 (1992) 1-4, 219-227; Chem. Dep., Fac. Sci., Assiut Univ., Assiut, Egypt; EN)