The present invention relates to novel chromone derivatives having effective antiallergic action with low toxicity, which are shown by the following formula (I) ##STR1## wherein R is hydrogen or lower alkyl and A is ##STR2## (R' is hydrogen or lower alkyl) or ##STR3## and their physiologically acceptable salts.
本发明涉及具有低毒性有效抗过敏作用的新型
香豆素衍
生物,其由以下式子(I)所示:##STR1## 其中R为氢或低碳基,A为##STR2##(其中R'为氢或低碳基)或##STR3##及其生理上可接受的盐。