1263W94 & Cidofovir AIDS-170703 AIDS170703 Phosphonic acid, [[(1S)-2-(4-amino-2-oxo-1(2H)-pyrimidinyl)-1-(hydroxymethyl)ethoxy]methyl]-, compd. with 5,6-dichloro-N-(1-methylethyl)-1-.beta.-L-ribofuranosyl-1H-benzimidazol-2-amine (1:1)