title: Merck protease inhibitor MK-639 -- trial cities announced.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000188:drug therapy*; D017320:HIV Protease Inhibitors / Q000627:therapeutic use*; D006801:Humans; D019469:Indinavir; D011725:Pyridines / Q000627:therapeutic use*; D015215:Zidovudine / Q000627:therapeutic use
chemical_list: D017320:HIV Protease Inhibitors; D011725:Pyridines; D015215:Zidovudine; D019469:Indinavir