- Anti-human immunodeficiency virus type 1 activity and in vitro toxicity of 2'-deoxy-3'-thiacytidine (BCH-189), a novel heterocyclic nucleoside analog. Soudeyns, H., Yao, X.I., Gao, Q., Belleau, B., Kraus, J.L., Nguyen-Ba, N., Spira, B., Wainberg, M.A. Antimicrob. Agents Chemother. (1991)