An orally available, irreversible inhibitor of epidermal growth factor receptor (EGFR), with potential antineoplastic activity. Upon oral administration, Hemay022 covalently binds to and inhibits the activity of EGFR, thereby preventing EGFR-mediated signaling. This may both induce cell death and inhibit tumor growth in EGFR-overexpressing tumor cells. EGFR, a receptor tyrosine kinase mutated in many tumor cell types, plays a key role in tumor cell proliferation and tumor vascularization.