L-696, 474, a novel cytochalasin as an inhibitor of HIV-1 protease. III. Biological activity - Lingham, R B; Hsu, A; Silverman, K C; Bills, G F; Dombrowski, A; Goldman, M E; Darke, P L; Huang, L; Koch, G; Ondeyka, J G; Goetz, M A (The J Antibiot (Tokyo), 1992)