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Carbazole derivatives that stabilized G-quadruplex DNA structure formed by human telomeric sequence have been designed and synthesized. Among them,3,6-bis(1-methyl-4-vinylpyridinium) carbazole diiodide ( BMVC) and 3,6-bis(4-methyl-2-vinylpyrazinium) carbazole diiodine (BMVC4) bound and stabilized G-quadruplex structure and had potent inhibitory effects against telomerase activity.The cellular effects of both BMVC and BMVC4 were characterized in cancer cells.These two compounds repressed tumor progression through both telomeredependent and telomere-independent pathways.