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Background:Enfuvirtide (T20),a fusion inhibitor derived from the C-terminal heptad repeat region (CHR) of HIV-1 gp41 is the only peptidic anti-HIV drug licensed by the US FDA.However,concerns have been raised over the increasing failure rate of therapy due to emergence of T20-resistant viruses in the treatment-experienced AIDS patients.Therefore,development of novel anti-HIV drugs against T20-resistant variants remains of high importance.