(-)-(2'R,5'S)-1-[2'-Hydroxymethyl-5'-(1,3-oxathiolanyl)]cytosine & 2-Butenamide, 2-cyano-3-hydroxy-N-[4-(trifluoromethyl)phenyl]-, (2Z)- 3TC & A77 1726 AIDS-079177 AIDS079177