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population and to enhance staff education and training programs.A novel series of homonucleosides and their double-headed analogs containing theophylline, 1,3,4-oxadiazole, and variant nucleobases was designed and synthesized. The new derivatives were fully characterized by HRMS, FT-IR, 1H NMR, and 13C NMR. The cytotoxic activities of all prepared compounds were screened in vitro against four cell lines, including fibrosarcoma (HT-108, breast (MCF-7 and MDA-MB-231), and lung carcinoma (A-549). The double-headed analogue 18 showed mark