Urea−PETT Compounds as a New Class of HIV-1 Reverse Transcriptase Inhibitors. 3. Synthesis and Further Structure−Activity Relationship Studies of PETT Analogues
forms of HIV-1. Most compounds have anti-HIV-1 activity on the wt in the nanomolar range. Resistant HIV-1 was selected in vitro for some of the compounds, and the time for resistant HIV-1 to develop was longer for urea-PETTcompounds than it was for reference compounds. Preliminary pharmacokinetics in rats showed that compound 18 is orally bioavailable and penetrates well into the brain. The three-dimensional