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MedKoo CAT#: 207060

CAS#: 1613191-99-3

Description: M4344, also known as VX-803, is an orally available inhibitor of ataxia telangiectasia and Rad3 related (ATR) kinase, with potential antineoplastic activity. Upon oral administration, ATR kinase inhibitor VX-803 selectively inhibits ATR activity and blocks the downstream phosphorylation of the serine/threonine protein kinase CHK1. This prevents ATR-mediated signaling, which results in the inhibition of DNA damage checkpoint activation, the disruption of DNA damage repair, and the induction of tumor cell apoptosis. ATR, a serine/threonine protein kinase upregulated in a variety of cancer cell types, plays a key role in DNA repair, cell cycle progression and survival; it is activated by DNA damage caused during DNA replication-associated stress.

Price and Availability

Size Price Shipping out time Quantity
Inquire bulk and customized quantity

Pricing updated 2020-08-11. Prices are subject to change without notice.

M4344 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#: 207060
Name: M4344
CAS#: 1613191-99-3
Chemical Formula: C25H29F2N9O3
Exact Mass: 541.2361
Molecular Weight: 541.5638
Elemental Analysis: C, 55.45; H, 5.40; F, 7.02; N, 23.28; O, 8.86

Synonym: M4344; M-4344; M 4344; VX-803; VX803; VX 803;

IUPAC/Chemical Name: 2-amino-6-fluoro-N-(5-fluoro-4-(4-(4-(oxetan-3-yl)piperazine-1-carbonyl)piperidin-1-yl)pyridin-3-yl)pyrazolo[1,5-a]pyrimidine-3-carboxamide


InChi Code: InChI=1S/C25H29F2N9O3/c26-16-9-30-23-20(22(28)32-36(23)12-16)24(37)31-19-11-29-10-18(27)21(19)34-3-1-15(2-4-34)25(38)35-7-5-33(6-8-35)17-13-39-14-17/h9-12,15,17H,1-8,13-14H2,(H2,28,32)(H,31,37)


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

Shelf Life:
>3 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).

HS Tariff Code:

Additional Information

Note: structure was from below web page: http://www.x-mobio.com/xmdetailpro.php?id=830, also Sci-finder