Antiasthma agents. 1. 4-Oxo-4H-(1) benzothieno-(3,2-b)pyran-2-carboxylic acid and 4-oxo-4H-(1)benzofuro(3,2-b)pyran-2-carboxylic acid.
D000818:Animals; D000937:Antigen-Antibody Reactions; D001200:Ascaris; D001249:Asthma / Q000188:drug therapy*; D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000627:therapeutic use; D005663:Furans / Q000138:chemical synthesis / Q000627:therapeutic use; D000882:Haplorhini; D006801:Humans; D008251:Macaca; D009682:Magnetic Resonance Spectroscopy; D010323:Passive Cutaneous Anaphylaxis; D011714:Pyrans / Q000138:chemical synthesis* / Q000627:therapeutic use; D051381:Rats; D012882:Skin Tests; D013552:Swine / Q000276:immunology; D013876:Thiophenes / Q000138:chemical synthesis / Q000627:therapeutic use
D002264:Carboxylic Acids; D005663:Furans; D011714:Pyrans; D013876:Thiophenes; C005656:4-oxo-4H-(1)benzofuro(3,2-b)pyran-2-carboxylic acid