The invention relates to novel heterocyclic compounds and pharmaceutical preparations thereof. The invention further relates to methods of treating or preventing cancer using the novel heterocyclic compounds of the invention.本發明係關於新穎雜環化合物及其醫藥製劑。本發明進一步係關於使用本發明之該等新穎雜環化合物治療或預防癌症之方法。