Epertinib is a reversible and selective tyrosine kinase inhibitor of EGFR, HER2, and HER4 (IC50s: 1.48 nM, 7.15 nM, and 2.49 nM). It displays a strong antitumor activity.
Erlotinib is a directly acting inhibitor EGFR tyrosine kinase inhibitor with an IC50 of 2 nM for human EGFR. Erlotinib D6 is a deuterium labeled Erlotinib .