Keap1-Nrf2-IN-21 (compound 4d) is a glucose metabolism inhibitor with antitumor activity. Keap1-Nrf2-IN-21 inhibits glycolytic activity of cancer cells by targeting the glycolytic pathway, especially by affecting the Keap1-Nrf2 signaling pathway, thereby inhibiting tumor growth. Keap1-Nrf2-IN-21 exhibits cytotoxicity against the HEC1A cell line ( IC 50 =2.60 μM).