B102(PARP/HDAC-IN-1) is a dual inhibitor of PARP and HDAC, with IC50 of 19.01 nM, 2.13 nM, 1.69 μM, > 10 μM for PARP1, PARP2, HDAC1, HDAC6, respectively, in an enzymatic assay. It exhibits anti-proliferative and anti-tumor effects. It also induces DNA damage and apoptosis in vitro.