| 摘要 |
Compounds of formula (I):or stereoisomers or pharmaceutically acceptable salts thereof, wherein W, R1,R 2 and R3 have the meanings as indicated in th e specification, are useful for treating conditions mediated by activation o f the adenosine A2A receptor, especially inflammatory or obstructive airways diseases. Pharmaceutical compositions that contain the compounds and a proc ess for preparing the compounds are also described.
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