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Catalog No.
Optimized reversible RAD51 inhibitor
Grouped product items
SizePriceStock Qty
10mM (in 1mL DMSO)
In stock
In stock
In stock

Tel: +1-832-696-8203

Email: [email protected]

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IC50: 44.17 μM

Homologous recombination (HR) is an essential process in cells that provides repair of DNA double-strand breaks and lesions that block DNA replication. RAD51 is an evolutionarily conserved protein that is central to HR. Overexpression of RAD51 protein is common in cancer cells and represents a potential therapeutic target in oncology. RI-2 is an optimized reversible RAD51 inhibitor.

In vitro: Although RI-2 did exhibit reduced activity relative to RI-1, it did retain enough activity to sensitize cells to MMC cell-based assays. RI-2 exhibited no reactivity toward glutathione after incubation for 24 hours. RAD51 protein that had been treated with RI-2 prior to washing exhibited no measurable loss of DNA binding activity, even though RI-2 is known to inhibit RAD51 with an IC50 of 44.17 μM. This indicates that RAD51 inhibition by RI-2 is fully reversible [1].

In vivo: RI-1, the analogue of RI-2, facilitated mapping of the binding pocket within known crystal structures of RAD51. However, this reactivity of RI-1 potentially may limit its development in pre-clinical animal models. RI-1 has been found to exhibit a relatively short half-life, due to reactivity in thiol-containing solutions [1].

Clinical trial: Up to now, RI-2 is still in the preclinical development stage.

[1] Budke B, Kalin JH, Pawlowski M, Zelivianskaia AS, Wu M, Kozikowski AP, Connell PP.  An optimized RAD51 inhibitor that disrupts homologous recombination without requiring Michael acceptor reactivity. J Med Chem. 2013 Jan 10;56(1):254-63.

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.1417162-36-7
Solubility≥21.65 mg/mL in DMSO; insoluble in H2O; insoluble in EtOH
Chemical Name1-(3,4-dichlorophenyl)-3-(4-methoxyphenyl)-4-morpholino-1H-pyrrole-2,5-dione
SDFDownload SDF
Canonical SMILESCOC1=CC=C(C(C(N2C3=CC(Cl)=C(Cl)C=C3)=O)=C(N4CCOCC4)C2=O)C=C1
Shipping ConditionEvaluation sample solution: ship with blue ice. All other available sizes: ship with RT, or blue ice upon request.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. Stock solution can be stored below -20°C for several months.

Quality Control

Quality Control & MSDS

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Chemical structure