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RS-1 is a stimulator of RAD51, a DNA repair protein. It is reported to function by stabilizing the active form and the DNA binding activity of RAD51. RS-1 enhances homology-directed repair 3-6 fold and CRISPR-Cas9 knock-in efficiency.


  • Purity: ≥95%
  • Synonyms: RAD51-Stimulatory Compound-1, RS1, MFCD00348720
  • Cas Number: 312756-74-4
  • References: Song, J., Yang, D., Xu, J., Zhu, T., Chen, Y. E., & Zhang, J. (2016). RS-1 enhances CRISPR/Cas9-and TALEN-mediated knock-in efficiency. Nature communications, 7. Pinder, J., Salsman, J., & Dellaire, G. (2015). Nuclear domain ‘knock-in’screen for the evaluation and identification of small molecule enhancers of CRISPR-based genome editing. Nucleic acids research, gkv993. Jayathilaka, K., Sheridan, S. D., Bold, T. D., Bochenska, K., Logan, H. L., Weichselbaum, R. R., ... & Connell, P. P. (2008). A chemical compound that stimulates the human homologous recombination protein RAD51. Proceedings of the National Academy of Sciences, 105(41), 15848-15853.
  • Application: FA
  • Formulation: Crystalline solid
  • Chemical Name: 3-(benzylsulfamoyl)-4-bromo-N-(4-bromophenyl)benzamide
  • Molecular Weight: 524.2
  • Molecular Formula: C20H16Br2N2O3S
  • Storage Conditions: Product should be kept at -20°C.
  • Pubchem Openeye Can Smiles: C1=CC=C(C=C1)CNS(=O)(=O)C2=C(C=CC(=C2)C(=O)NC3=CC=C(C=C3)Br)Br