| abstract |
Compounds of the formula IN WHICH P to T1 are hydrogen, alkyl, alkoxy, alkenyl, alkenyloxy, substituted alkyl, substituted alkoxy, substituted alkenyl, substituted alkenyloxy, amino, substituted amino aminoalkoxy, substituted aminoalkoxy, nitro, halo, hydroxy, or benzyloxy; the R1 groups are hydrogen, substituted or unsubstituted alkyl, alkoxy or aryl; and X is a carbon - carbon bond or a single atom, which may be substituted, through which the chromone nuclei are linked, and pharmaceutically acceptable derivatives thereof, are indicated for use in the treatment of ''extrinsic'' allergic asthma. |