dual inhibitors of pan-RAF/VEGFR2 is important for the treatment of K-Ras mutated colorectal cancer, which is one of the most common and lethal malignancies. Building upon our studies in dual inhibitors of pan-RAF/VEGFR2, we designed and synthesized new dual inhibitor candidates by installing a urea or guanidine moiety to the previously reported dual inhibitors in order to enhance both metabolic stability