Fig. (6) HIV-1 replication dose response to individual compounds. The range of concentrations at which compounds DK (a), DL (b), DM (c) and DP (d) effectively inhibit HIV-1 replication was determined by infecting A3.01 cells with HIV-1_LAV in the presence of decreasing amounts of the compounds. Virus levels in culture supernatant were determined by RT assay, and % of viral replication was determined by comparison with the untreated (concentration of 0) control.