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It is widely accepted that specific inhibitors of the HIV-1 aspartic protease might be interesting chemical leads to develop effective therapeutic agents for the treatment of AIDS12). In the course of a screening program to discover new inhibitors of HIV-1 protease from microbial fermentation broths3), we have isolated the novel molecules GE20372 factors A (1) and B (2) shown in Fig. 1. These microbial products are tetrapeptide derivatives structurally related to the previously described microbial

GE20372 Factor A and B. New HIV-l Protease Inhibitors, Produced by Strcptomyccs sp. ATCC 55925.