HA14-1 is a potent small-molecule inhibitor of B-cell lymphoma 2 (Bcl-2), a protein factor binding to and inactivating pro-apoptotic proteins (such as Bax and BH3-only family proteins) to suppress apoptosis, that potently inhibits the anti-apoptotic of Bcl-2 and induces apoptosis with values of 50% inhibition concentration IC50 ranging from 10 to 20 μM in NIH3T3, HL60 and lung cancer H1299 cell lines. HA14-1 binds to Bcl-2 by mimicking the BH3 domain required for homo- and hetero-dimer formation and hence prevents the binding of these proteins subsequently resulting in the inhibition of Bcl-2. HA14-1 has been widely investigated in studies of apoptosis, which potentiates it to be used for the treatment of cancer.