Compounds of the formula I: or a pharmaceutical salt thereof, wherein X, Ar1, R1, R2, R3, R4, R5, R6 and R7 are as defined herein.. Also disclosed are methods of making the compounds and using the compounds for treatment of inflammatory diseases such as arthritis.本發明揭示式I化合物:或其醫藥學上之鹽,其中,X、Ar1、R1、R2、R3、R4、R5、R6及R7如本文所定義。亦揭示製造該等化合物以及使用該等化合物治療諸如關節炎之發炎疾病的方法。