Disclosed are compounds of the formula I and the pharmaceutically acceptable salts of such compounds. Also disclosed are processes for the preparation of such compounds, intermediates used in the preparation of such compounds, and the uses of such compounds in treating inflammatory skin diseases.本發明揭示式I化合物及此等化合物之醫藥學上可接受之鹽。本發明亦揭示製備此等化合物之方法、用於製備此等化合物之中間物、及此等化合物治療發炎性皮膚疾病之用途。