申请人:Warner-Lambert Company
公开号:US04046769A1
公开(公告)日:1977-09-06
There is disclosed 4,10-dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-2-carboxylic acids, salts and esters of the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, halogen, hydroxy or lower alkoxy; R.sub.2 is hydrogen, aralkyl or lower alkyl; R.sub.3 is hydrogen or lower alkyl and their pharmaceutically acceptable salts. These compounds are useful in the management of allergic conditions such as bronchial asthma, hay fever and so on.
本文公开了4,10-二氢-4,10-二氧-1H-1-苯并吡喃[3,2-b]吡啶-2-羧酸、其盐和酯,其化学式为:##STR1## 其中R.sub.1为氢、低级烷基、卤素、羟基或低级烷氧基;R.sub.2为氢、芳基烷基或低级烷基;R.sub.3为氢或低级烷基,以及它们的药学上可接受的盐。这些化合物在过敏症(如支气管哮喘、花粉热等)的管理中非常有用。