The present invention provides novel compounds having the general formula: wherein R1 to R4, L1, L2 and X are as described herein, compositions including the compounds and methods of using the compounds.
本发明提供具有通式的新化合物:其中R1至R4、L1、
L2和X如本文所述,包括这些化合物的组合物和使用这些化合物的方法。