EGFR-IN-91 (compound 9) is an orally available EGFR inhibitor with blood-brain barrier penetrability. EGFR-IN-91 inhibits EGFR L858R/C797S and EGFR exon 19del/C797S , inducing tumor regression in xenograft (PDX) mouse models. EGFR-IN-91 has the potential to inhibit localized and metastatic non-small cell lung cancer (NSCLC) driven by EGFR mutants.