3TC & HBY 097 AIDS-070916 AIDS070916 cis-1-[2'-Hydroxymethyl-5'-(1,3-oxathiolanyl)]cytosine & (S)-7-Methoxy-3,4-dihydro-2-[(methylthio)methyl]-3-thioxo-2(1H)-quinoxalinecarboxylic acid, isopropyl ester