ITK Degrader 1, a highly selective interleukin-2-inducible T-cell kinase (ITK; DC50=3.6 nM in vivo in mice) degrader, induces rapid and prolonged degradation of ITK and effectively suppresses IL-2 secretion (EC50=35.2 nM, Jurkat cells) stimulated by anti-CD3 antibody in vivo. Additionally, it demonstrates favorable plasma exposure levels [1].