EGFR-IN-52 (Compound 4) is a highly effective inhibitor of the epidermal growth factor receptor (EGFR). It exhibits IC50 values of 0.358, 86.02, and 432.67 μM against EGFR, EGFR L858R-TK, and EGFR T790M-TK, respectively. Additionally, EGFR-IN-52 demonstrates potent cytotoxic effects on cancer cell lines and triggers apoptosis [1].