The present invention relates to compounds of formula I shown below: wherein R1and R2are each as defined in the application. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of diseases or conditions in which adenosine CD73 activity is implicated, such as, for example, cancer.
                            本发明涉及以下式子的化合物:其中R1和R2在本申请中分别定义。本发明还涉及制备这些化合物的过程,包括它们的制药组合物,以及它们在治疗与
腺苷CD73活性有关的疾病或病况方面的用途,例如癌症。