WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 407272

CAS#: Unknown

Description: A-196 is the first potent and selective chemical probe for SUV420H1 and SUV420H2. The in vitro activity of A-196 includes inhibition of SUV420H1 with IC50 = 25 nM and SUV420H2 with IC50 = 144 nM for methylation of H4K20me and greater than 100-fold selectivity over other histone methyltransferases and non-epigenetic targets. In cell assays, A-196 inhibits the di- and tri-methylation of H4K20me in multiple cell lines with IC50 < 1 µM.

Price and Availability




A-196 is not in stock, may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to sales@medkoo.com to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 407272
Name: A-196
CAS#: Unknown
Chemical Formula: C18H16Cl2N4
Exact Mass: 358.0752
Molecular Weight: 359.254
Elemental Analysis: C, 60.18; H, 4.49; Cl, 19.74; N, 15.60

Synonym: A-196; A 196; A196.

IUPAC/Chemical Name: 6,7-dichloro-N-cyclopentyl-4-(pyridin-4-yl)phthalazin-1-amine


InChi Code: InChI=1S/C18H16Cl2N4/c19-15-9-13-14(10-16(15)20)18(22-12-3-1-2-4-12)24-23-17(13)11-5-7-21-8-6-11/h5-10,12H,1-4H2,(H,22,24)


Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO, not in water

Shelf Life:
>2 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

Harmonized System Code:

Additional Information

Histone H4 lysine 20 methylation is emerging as a crucial modification to ensure genomic integrity both in the absence and presence of genotoxic stress. The majority of histone H4 methylation is detected in the lysine 20 (H4K20) and is evolutionarily conserved from yeast to human. Each methylation state results in distinct biology: dimethylated H4K20 (H4K20me2) is involved in DNA replication and DNA damage repair, and trimethylated H4K20 (H4K20me3) results in silenced heterochromatic regions . Loss of histone H4 lysine 20 trimethylation (H4K20me3) is characteristic of human cancer and a potential prognostic marker in many types of cancers.