title: Letter: SCH 1000--an atropine alkaloid bronchodilator.
mesh_terms: D001249:Asthma / Q000188:drug therapy*; D001286:Atropine Derivatives; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D006801:Humans; D009241:Ipratropium / Q000627:therapeutic use*
chemical_list: D001286:Atropine Derivatives; D001993:Bronchodilator Agents; D009241:Ipratropium