| abstract |
The present invention relates to novel chromone derivatives having effective anti-allergic action, which are shown by the following general formula (I) wherein m is 0, 1 or 2, n is 0 or 1, and each of R''s represents halogen atom, nitro, hydroxy, alkyl including the case where the two alkyl groups on any two adjacent carbon atoms at positions 5, 6, 7 and 8 form a benzene ring with the two carbon atoms, lower alkoxy, acyloxy, carboxy which may be esterified, carboxamide which may be unsubstituted or substituted by at least one alkyl or aralkyl group, or amino group which may be unsubstituted or substituted by acyl group or hydrocarbon residue, and their pharmaceutically acceptable salts. |