6-Benzyl-1-(ethoxymethyl)-5-isopropyluracil & Butanoic acid, octahydro-1,7,8-trihydroxy-6-indolizinyl ester, [1S-(1.alpha.,6.beta.,7.alpha.,8.beta.)]- & 3'-Azido-3'-deoxythymidine AIDS-045054 AIDS045054 MKC-442 & MDL-28574 & AZT