Tubulin/HDAC-IN-4 (compound 9n) is a dual Tubulin and HDAC inhibitor with IC₅₀ values of 0.73, 0.43, 0.62, 2.34 µM for HDAC1, HDAC2, HDAC6, HDAC7, respectively. Tubulin/HDAC-IN-4 inhibits the tubulin polymerization by targeting the colchicine binding site. Tubulin/HDAC-IN-4 induces apoptosis and cell cycle arrest at G2/M phase. Tubulin/HDAC-IN-4 induces a significant elevation of intracellular ROS levels. Tubulin/HDAC-IN-4 shows anti-angiogenesis activity and anticancer activity^[1].