The invention provides new heterocyclic compounds having the general Formula (I), or a pharmaceutically acceptable salt thereof,wherein R1, R2, X, Y1and Y2are as described herein, compositions including the compounds, processes of manufacturing the compounds and methods of using the compounds.本發明提供具有通式(I)之新穎雜環化合物或其醫藥學上可接受之鹽,其中R1、R2、X、Y1及Y2如本文所描述;包括該等化合物之組合物;製造該等化合物之方法及使用該等化合物之方法。