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A series of novel 11,4″-disubstituted azithromycin analogs were synthesized and evaluated for their antibacterial activity. All the 11,4″-disubstituted analogs exhibited excellent activity (0.03–0.12 μg/ml) against erythromycin-susceptible Streptococcus pneumoniae, and significantly improved activity against three phenotypes of erythromycin-resistant S. pneumoniae compared with erythromycin A, clarithromycin...
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