| 摘要 |
<p>This invention is directed to the compounds of the formula <IMAGE> (I) wherein R1 is hydrogen or an alkyl of from 1 to 6 carbon atoms; R2 is an alkyl of from 1 to 3 carbon atoms; R3 is hydrogen or an alkyl of from 1 to 3 carbon atoms; and R4 is hydrogen or an alkyl of from 1 to 4 carbon atoms. These compounds are useful in pharmaceutical compositions which serve as analgesics, antiphlogistics and antipyretics.</p> |
