Compounds of formula I: ##STR1## wherein Y is hydrogen, lower alkyl, halogen or lower alkoxy; X is carboxy, alkoxycarbonyl, carboxamide, cyano or tetrazolo, and their non-toxic, pharmaceutically acceptable salts are disclosed. These compounds are useful in the prevention of allergic and asthmatic reactions.
化合物的公式为I:##STR1## 其中Y是氢,低烷基,卤素或低烷氧基; X是羧基,烷氧羰基,羧酰胺,
氰基或
四唑基,以及它们的非毒性,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。