one of the regulatory gene products in the HIV-1 genome, Revprotein must be translocated from the nucleus to the cytoplasm to exert its function. Therefore, inhibition of Revproteintranslocation could be a useful target for HIV therapy. An extract from the Streptomyces strain A92-308902 with very potent inhibitory activity was found in the course of a high throughput screening with a Rev translocation