Zalcitabine;扎西他滨;7481-89-2 Formula:C9H13N3O3 Zalcitabine (trade name Hivid) is a nucleoside analog HIV reverse transcriptase inhibitor (NARTI). It is an antiviral pyrimidine nucleoside analogue effective against HIV replication. 2′,3′-Dideoxycytidine, when activated to its triphosphate, is incorporated into DNA by HIV-1 RT (HIV-1 reverse transcriptase), causing DNA chain termination and viral replication. Zalcitabine was the third antiretroviral to be approved by the Food and Drug Administration (FDA) for the treatment of HIV/AIDS. It is used as part of a combination regimen. Zalcitabine appears less potent than some other nucleoside RTIs, has an inconvenient three-times daily frequency and is associated with serious adverse events.