| 摘要 |
Disclosed is a compound of formula (I), or a pharmaceutically acceptable salts thereof, wherein R1 is C2-4alkyl and is substituted by two or more fluorine groups, and R2 is methyl or ethyl. Also disclosed is a process for preparing the compound, and the use of the compound for treating conditions mediated by one or more metalloproteinase enzymes or by collagenase 3, such as osteoarthritis or rheumatoid arthritis.
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