– HDAC-IN-88 (Compound HJ-9) is a potent inhibitor of HDAC, effectively targeting HDAC6, HDAC1, HDAC2, HDAC8, and HDAC3 with IC50 values of 0.226, 1.103, 2.308, 3.255, and 3.864 μM, respectively. This compound suppresses the proliferation of cancer cells HepG2, HCT116, and MV4-11 with IC50 values of 5.47, 9.78, and 0.38 μM, respectively. Additionally, it inhibits the migration of HCT116 cells, causes cell cycle arrest at the G0/G1 phase, and induces apoptosis and autophagy in MV4-11 cells. HDAC-IN-88 reduces ROS levels and mitochondrial membrane potential and demonstrates antimalarial activity by inhibiting Plasmodium falciparum 3D7 with an EC50 of 165 nM. Furthermore, HDAC-IN-88 exhibits anti-angiogenic properties.