Kinome selectivity, safety profiles, PK and ADME profiles were also characterized. ABSK112 showed potent inhibition of proliferation in multiple EGFR Exon20 mutation cell lines and superior wild-type EGFR selectivity compare to other inhibitors including mobocertinib (TAK788). ABSK112 is a novel and next-generation EGFR Exon20 mutation inhibitor with improved selectivity over wild-type EGFR and strong brain penetrating ability. It has demonstrated superior in vivo efficacy in several xenograft models with various EGFR Exon20 mutations, and excellent drug-like properties supporting its further development into clinical studies.