MS9427 TFA is a potent PROTAC EGFR degrader with Kds of 7.1 nM and 4.3 nM for EGFR WT and EGFR L858R, respectively. MS9427 TFA selectively degrades the mutant but not the WT EGFR through both the ubiquitin/proteasome system (UPS) and autophagy/lysosome pathways. MS9427 TFA potently inhibits the proliferation of NSCLC cells. MS9427 TFA can be used for researching anticancer.