The invention provides compounds which are prodrugs of a JAK inhibitor agent for the targeted delivery of the JAK inhibitor to the gastrointestinal tract of a mammal. The invention also provides pharmaceutical compositions comprising the compounds, methods of using the compounds to treat gastrointestinal inflammatory diseases, and processes and intermediates useful for preparing the compounds.本發明提供作為JAK抑制劑之前藥的化合物,其用於將JAK抑制劑靶向傳遞至哺乳動物之胃腸道。本發明亦提供包含該等化合物之醫藥組合物、使用該等化合物治療胃腸發炎性疾病之方法、及適用於製備該等化合物之方法及中間物。