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At present,there are more than 20 anti-HIV drugs,which belonged to 6 different classes,approved since the first anti-HIV drug,azidothymidine (AZT)marketed in 1987.1 Among them,NNRTIs are still an important class of anti-HIV drugs due to their possessing high potency and low toxicity.2,3 Nevertheless,a primary drawback in the use of the approved NNRTIs is the rapid emergence of drug resistance.Therefore,a great challenge is continuously to develop new chemical entities that are effective against both the wild type and mutant forms of the reverse transcriptase.