| 摘要 |
The present invention relates to novel 2-amino-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-3-carboxylic acid derivatives useful for prophylaxis and therapy of allergic diseases such as allergic asthma, allergic dermatitis and hay fever, which have the following formula: <IMAGE> wherein A is <IMAGE> (R, R1 and R2 are independently hydrogen or lower alkyl and m is 0 or 1, with the proviso that when m is 1, R1 is hydrogen) or R-Co- (R has the same meaning as defined above), or a physiologically acceptable salt thereof, and to a method for preparing the same.
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