title: AZT patent challenge.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000188:drug therapy / Q000191:economics*; D002170:Canada; D004345:Drug Industry / Q000191:economics*; D006801:Humans; D010330:Patents as Topic; D015215:Zidovudine / Q000627:therapeutic use*
chemical_list: D015215:Zidovudine