Purity >98%. BMS 626529 is an inhibitor of HIV-1 attachment. It binds to non-ligand bound HIV-1 gp120 to inhibit HIV-1 interaction with host CD4+ T cells and subsequent HIV-1 binding and cell entry. BMS 626529 reduces infectivity of laboratory strains and clinical isolates of HIV-1 (EC50s = 0.4-2,000 and 25-2,000 nM, respectively) with cytotoxic concentration (CC50) values greater than 100 μM in a panel of mammalian cell lines.