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

MedKoo CAT#: 200848

CAS#: 1138549-36-6 (free base)

Description: CX-5461 is a first-in-class non-genotoxic small molecule targeted inhibitor of RNA polymerase I (Pol I) that activates the p53 pathway without causing DNA damage. CX-5461 selectively inhibits rRNA synthesis by Pol I in the nucleolus, but does not inhibit mRNA synthesis by RNA Polymerase II (Pol II) and does not inhibit DNA replication or protein synthesis. Inhibition of Pol I results in nucleolar stress and release of ribosomal proteins (RP) from the nucleolus. The RP bind to Mdm2 and liberate p53 to orchestrate apoptosis in cancer cells. CX-5461 demonstrates a favorable preclinical profile, potently and selectively kills cancer cells, demonstrates robust in vivo efficacy in multiple models, and has demonstrated oral bioavailability in multiple species.

Chemical Structure

CAS# 1138549-36-6 (free base)

Theoretical Analysis

MedKoo Cat#: 200848
Name: CX-5461
CAS#: 1138549-36-6 (free base)
Chemical Formula: C27H27N7O2S
Exact Mass: 513.19469
Molecular Weight: 513.61
Elemental Analysis: C, 63.14; H, 5.30; N, 19.09; O, 6.23; S, 6.24

Size Price Shipping out time Quantity
10mg USD 190 Same day
25mg USD 350 Same day
50mg USD 550 Same day
100mg USD 950 Same day
200mg USD 1650 Same day
500mg USD 2750 Same day
1g USD 3650 Same day
2g USD 6450 2 Weeks
5g USD 12650 2 Weeks
Inquire bulk and customized quantity

Pricing updated 2021-02-28. Prices are subject to change without notice.

CX-5461, purity > 98%, is in stock. The same day shipping out after order is received.

Related CAS #: 2101314-20-7 (HCl)   1138549-36-6 (free base)  

Synonym: CX5461; CX 5461; CX-5461; Pidnarulex

IUPAC/Chemical Name: 2-(4-methyl-1,4-diazepan-1-yl)-N-((5-methylpyrazin-2-yl)methyl)-5-oxo-5H-benzo[4,5]thiazolo[3,2-a][1,8]naphthyridine-6-carboxamide


InChi Code: InChI=1S/C27H27N7O2S/c1-17-14-29-18(15-28-17)16-30-26(36)23-24(35)19-8-9-22(33-11-5-10-32(2)12-13-33)31-25(19)34-20-6-3-4-7-21(20)37-27(23)34/h3-4,6-9,14-15H,5,10-13,16H2,1-2H3,(H,30,36)


white 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).

HS Tariff Code:

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
Soluble in DMSO, not in water 100.0

Preparing Stock Solutions

The following data is based on the product molecular weight 513.61 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Select a batch to recalculate based on the batch molecular weight:
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Quin JE, Devlin JR, Cameron D, Hannan KM, Pearson RB, Hannan RD. Targeting the nucleolus for cancer intervention. Biochim Biophys Acta. 2014 Jun;1842(6):802-816. doi: 10.1016/j.bbadis.2013.12.009. Epub 2014 Jan 2. Review. PubMed PMID: 24389329.

2: Achiron A, Mashiach R, Zilkha-Falb R, Meijler MM, Gurevich M. Polymerase I pathway inhibitor ameliorates experimental autoimmune encephalomyelitis. J Neuroimmunol. 2013 Oct 15;263(1-2):91-7. doi: 10.1016/j.jneuroim.2013.08.002. Epub 2013 Aug 15. PubMed PMID: 23998422.

3: Bywater MJ, Poortinga G, Sanij E, Hein N, Peck A, Cullinane C, Wall M, Cluse L, Drygin D, Anderes K, Huser N, Proffitt C, Bliesath J, Haddach M, Schwaebe MK, Ryckman DM, Rice WG, Schmitt C, Lowe SW, Johnstone RW, Pearson RB, McArthur GA, Hannan RD. Inhibition of RNA polymerase I as a therapeutic strategy to promote cancer-specific activation of p53. Cancer Cell. 2012 Jul 10;22(1):51-65. doi: 10.1016/j.ccr.2012.05.019. PubMed PMID: 22789538; PubMed Central PMCID: PMC3749732.

4: Drygin D, Lin A, Bliesath J, Ho CB, O'Brien SE, Proffitt C, Omori M, Haddach M, Schwaebe MK, Siddiqui-Jain A, Streiner N, Quin JE, Sanij E, Bywater MJ, Hannan RD, Ryckman D, Anderes K, Rice WG. Targeting RNA polymerase I with an oral small molecule CX-5461 inhibits ribosomal RNA synthesis and solid tumor growth. Cancer Res. 2011 Feb 15;71(4):1418-30. doi: 10.1158/0008-5472.CAN-10-1728. Epub 2010 Dec 15. PubMed PMID: 21159662.

Additional Information