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Abstract
Several purine and pyrimidine β-L-dideoxynucleosides were stereospecifically synthesized and their antiviral properties examined. Two of them, namely β-L-2′,3′-dideoxyadenosine (β-L-ddA) and its 2′,3′-didehydro derivative (β-L-d4A) were found to have significant anti-human immunodeficiency virus (HIV) and anti-hepatitis B virus (HBV) activities in cell culture.