3TC & TSAO-m^3T AIDS-080903 AIDS080903 cis-1-[2'-Hydroxymethyl-5'-(1,3-oxathiolanyl)]cytosine & Thymidine, 3-methyl, [2',5'-bis-O-(tert-butyldimethylsilyl)-.beta.-D-ribofuranosyl]-3'-spiro-5-(4-amino-1,2-oxathiole-2,2-dioxide)