1263W94 & Lamivudine 2(1H)-Pyrimidinone, 4-amino-1-[(2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, compd. with 5,6-dichloro-N-(1-methylethyl)-1-.beta.-L-ribofuranosyl-1H-benzimidazol-2-amine (1:1) AIDS-170705 AIDS170705