RS-1, CRISPR Editing Enhancer

Catalog No. size PriceQuantity
M60300-2S 2 mg solid $89
M60300-10S 10 mg solid $356


RS-1 was previously characterized as a RAD51-Stimulatory compound and now found to be an HDR enhancer to enhance CRISPR/Cas9- and TALEN-mediated knock-in efficiency. It increases the knock-in efficiency by two- to five-fold at different loci, whereas NHEJ inhibitor SCR7 has minimal effects. RS-1 was applied for animal production and have achieved multifold improvement on the knock-in rates as well. RS-1 can stimulate the human homologous recombination protein RAD51in various conditions. In PC3 prostate cancer cells, RS-1–induced lethality was accompanied by the formation of microscopically visible RAD51 nuclear protein foci occurring in the absence of any DNA-damaging treatment. Treatment with RS-1 promoted significant antitumor responses in a mouse model.

Product information

CAS Number: 312756-74-4

Molecular Weight: 524.23

Formula: C20H16Br2N2O3S

Chemical Name: 3-(N-benzylsulfamoyl)-4-bromo-N-(4-bromophenyl)benzamide

Smiles: O=C(NC1C=CC(Br)=CC=1)C1C=C(C(Br)=CC=1)S(=O)(=O)NCC1C=CC=CC=1


InChi: InChI=1S/C20H16Br2N2O3S/c21-16-7-9-17(10-8-16)24-20(25)15-6-11-18(22)19(12-15)28(26,27)23-13-14-4-2-1-3-5-14/h1-12,23H,13H2,(H,24,25)

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMSO up to 100 mM

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined.

HS Tariff Code: 382200

How to use

In Vitro:

RS-1 was used at 15 µM final concentration in TALEN- or Cas9-mediated knock-in experiments.

In Vivo:

RS-1 was used at 7.5 μM for the in vivo knock-in animal production. RS-1 can be dosed to animal by IP injection at 110 mg/Kg once per day to get antitumor responses.


  1. Jayathilaka K, et al. A chemical compound that stimulates the human homologous recombination protein RAD51. (2008) Proc Natl Acad Sci USA. 105(41):15848-53.
  2. Mason JM, et al. The RAD51-stimulatory compound RS-1 can exploit the RAD51 overexpression that exists in cancer cells and tumors. (2014) Cancer Res. 74(13):3546-55.
  3. Song J, et al. RS-1 enhances CRISPR/Cas9- and TALEN-mediated knock-in efficiency. (2016) Nat Commun. 7:10548.

Products are for research use only. Not for human use.


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