RI-1 is a RAD51 inhibitor with IC50 ranging from 5 to 30 μM.

RI-2 is an optimized RAD51 inhibitor with an IC50 of 44.17 μM in the standard DNA binding assay; specifically inhibits HR(Homologous recombination) repair in human cells.

RI(dl)-2 TFA is a potent and selective RAD51-mediated D-loop formation inhibitor with an IC50 of 11.1 μM. RI(dl)-2 TFA does not influence RAD51 binding to ssDNA and inhibits homologous recombination (HR) activity in human cells (IC50 of 3.0 μM).

CAM833 (CAM-833) is a potent, specific chemical inhibitor of the RAD51-BRCA2 interaction and RAD51 oligomerization with Kd of 366 nM; CAM833 inhibited RAD51 foci formation 6 h after exposure to 3 Gy IR, in a concentration-dependent manner with an IC50 of 6 uM, causeed a concentration-dependent decrease in RAD51 foci accompanied by increased DNA damage in A549 cells. CAM833 inhibted RAD51 molecular clustering at DNA damage sites visualized by SMLM, suppressed homologous recombination and potentiated cell-cycle arrest. CAM833 potentiated the growth suppressive effect of PARP1 inhibition in BRCA2 wild-type cells, as well as dose-dependent growth inhibition when combined with ionizing radiation.