The present invention relates to inhibitors of histone deacetylases, in particular HDAC8, that are useful for the treatment of cancer and other diseases and disorders, as well as the synthesis and applications of said inhibitors.本發明係關於組蛋白去乙醯酶,特別是HDAC8之抑制劑,其適用於治療癌症及其他疾病及病症;以及該等抑制劑之合成及應用。