Compounds of the formula I in which U, V and W have the meanings indicated in Claim 1, are inhibitors of Tankyrase, and can be employed, inter alia, for the treatment of diseases such as cancer, cardiovascular diseases, central nervous system injury and different forms of inflammation.本發明提供式I化合物其中U、V及W具有申請專利範圍第1項中所示之含義,其係端錨聚合酶(Tankyrase)之抑制劑,且尤其可用於治療疾病,諸如癌症、心血管疾病、中樞神經系統損傷及不同形式之發炎。