BC-LI-0186 is a potent and selective inhibitor of Leucyl-tRNA synthetase (LRS; LeuRS) and Ras-related GTP-binding protein D (RagD) interaction (IC50=46.11 nM). BC-LI-0186 competitively binds to the RagD interacting site of LRS (Kd=42.1 nM) and has on effects on LRS-Vps34, LRS-EPRS, RagB-RagD association, mTORC1 complex formation or the activities of 12 kinases. BC-LI-0186 can effectively suppress the activity of cancer-associated MTOR mutants and the growth of rapamycin-resistant cancer cells. BC-LI-0186 is a promising agent for lung cancer research.