STAT3-D11-PROTAC-VHL (Compound D11-PROTAC) is a PROTAC degrader targeting signal transducer and activator of transcription 3 (STAT3). It demonstrates anti-tumor activity with IC50 values of 1335 nM in HeLa cells and 1973 nM in MCF-7 cells. The compound binds to the DNA binding domain of STAT3, recruits the E3 ligase VHL to form a ternary complex, leading to ubiquitination and subsequent proteasomal degradation of STAT3. Additionally, STAT3-D11-PROTAC-VHL inhibits tumor cell growth, induces cell cycle arrest and apoptosis (apoptosis), and suppresses tumor immune evasion.