Antitumor agent-70 (compound 8b) is a highly potent multi-targeted kinase inhibitor, particularly targeting c-Kit. It demonstrates remarkable anti-tumor activity and the ability to induce cell apoptosis. This compound also exhibits strong inhibition of multiple myeloma, with an IC 50 value of 0.12 μM. Therefore, Antitumor agent-70 holds great potential as an effective therapy for combating cancer, especially in cases involving c-Kit. [1]