1-((2R,5R)-5-Ethynyl-5-hydroxymethyl-2,5-dihydro-furan-2-yl)-5-methyl-1H-pyrimidine-2,4-dione & 2'-Deoxycytidine & 2(1H)-Pyrimidinone, tetrahydro-4-hydroxy-1-.beta.-D-ribofuranosyl- 4'-Ethynyl D4T + dCyd + THU AIDS-223053 AIDS223053