It was established that 5'-phosphonates of 3'-azido-2',3'-dideoxythymidine (AZT) inhibit HIV reproduction in the MT-4 cell line as well as AZT. However, the viability of HIV-infected MT-4 cells after treatment with phosphonates was considerable higher that after AZT treatment. Inhibitory activities of 5'-phosphonates of 3'-fluoro-2',3'-dideoxythymidine (FLT) on HIV-infected MT-4 cells were rather low. The mechanism of action of these derivatives and prospects for their application for suppressing HIV infection are discussed.

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