2′,3′-Dideoxy-5-ethyluridine

2′,3′-Dideoxy-5-ethyluridine (ddEtUrd) is an antiretroviral compound with weak anti-HIV activity. The 3'-substituted derivatives of 2′,3′-Dideoxy-5-ethyluridine did not show significant antiviral effects. 2′,3′-Dideoxy-5-ethyluridine was less potent in inhibiting HIV replication in human MT4 lymphocytes. Although phosphorylation induced by 2′,3′-Dideoxy-5-ethyluridine is essential for antiviral activity, there is no strong correlation between its affinity for human dThd kinase or dCyd kinase[1].