This invention relates to Compounds of formula II: ##STR1## wherein Y is formyl, carboxylic acid, acrylic acid, cyano or tetrazolo; X is hydrogen, lower alkanoyl or lower alkyl, and their non-toxic, pharmaceutically acceptable salts are disclosed. These compounds are useful in the prevention of allergic and asthamatic reactions.
本发明涉及式II的化合物:##STR1## 其中Y为甲酰基、
羧酸、
丙烯酸、
氰基或
四唑基;X为氢、低级烷酰基或低级烷基,并且公开了它们的非毒性、药学上可接受的盐。这些化合物在预防过敏和哮喘反应方面是有用的。