1263W94 & Didanosine 6H-Purin-6-one, 1,9-dihydro-9-[(2R,5S)-tetrahydro-5-(hydroxymethyl)-2-furanyl]-, compd. with 5,6-dichloro-N-(1-methylethyl)-1-.beta.-L-ribofuranosyl-1H-benzimidazol-2-amine (1:1) AIDS-170706 AIDS170706