| 摘要 |
The present invention relates to (2-oxo-2H-1-benzopyran-3-yl)aminooxoacetic acids and their derivatives having the following structural formula: <IMAGE> I wherein R1 is hydrogen, halogen, hydroxy, lower alkoxy, lower alkyl or nitro and R2 is hydrogen or lower alkyl and their pharmaceutically acceptable salts thereof; these compounds are indicated in the management of allergic manifestations such as, for example, asthma, hay fever and the like. The present invention relates to (2-oxo-2H-1-benzopyran-3-yl)aminooxoacetic acids and their derivatives having the following structural formula: <IMAGE> I wherein R1 is hydrogen, halogen, hydroxy, lower alkoxy, lower alkyl or nitro. R2 is hydrogen or lower alkyl and their pharmaceutically acceptable salts thereof.
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