TBK1/IKKε-IN-5 (compound 1) is an orally active TBK1 and IKKε dual inhibitor, with IC50 values of 1 and 5.6 nM, respectively. TBK1/IKKε-IN-5 enhances the blockade response to PD-1 and induces immune memory in rats when combines with anti-PD-L1. TBK1/IKKε-IN-5 can be used in cancer research, especially in tumour immunity.