Catalog Number: 4701
Chemical Name: 5-[2-Amino-4-chloro-7-[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-methyl-4-pentyn-2-ol
Biological Activity
High affinity, potent and selective Hsp90 inhibitor (Ki = 0.2 nM and IC50 = 1.1 nM). Exhibits selectivity for Hsp90 over Grp94 and TRAP1 (Ki values are 61 and 255 nM respectively) and has no effect (IC50 >10 μM) against a panel of 285 kinases. Degrades Her-2 in MCF-7 breast cancer cells (EC50 = 14 nM). Blocks tumor growth and induces partial tumor regression in an N87 gastric tumor mouse model. Also inhibits LPS-induced TNFα release in an LPS shock mouse model and suppresses disease development in a rat model of collagen-induced arthritis. Exhibits <20-fold efficacy over BIIB 021 (Cat. No. 4608) in mice. Orally available and brain penetrant.
Technical Data
  • M.Wt:
  • Formula:
  • Solubility:
    Soluble to 100 mM in DMSO
  • Purity:
  • Storage:
    Store at -20°C
  • CAS No:
The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis. All Tocris products are intended for laboratory research use only.
Background References
  1. EC144 is a potent inhibitor of the heat shock protein 90.
    Shi et al.
    J.Med.Chem., 2012;55:7786
  2. EC144, a synthetic inhibitor of heat shock protein 90, blocks innate and adaptive immune responses in models of inflammation and autoimmunity.
    Yun et al.
    J.Immunol., 2011;186:563
Tocris Bioscience is the leading supplier of novel and exclusive tools for life science research with over 30 years' experience in the industry. Tocris is a Bio-Techne brand.

Order Details


Contact Information

Molarity Calculator
Calculate the mass, volume or concentration required for a solution

The molarity calculator is based on the following equation:

Mass (g) = Concentration (mol/L) x Volume (L) x Molecular Weight (g/mol)
An example of a molarity calculation using the molarity calculator:
What is the mass of compound required to make a 10 mM stock solution in 10 ml of water given that the molecular weight of the compound is 197.13 g/mol?

R&D Systems Guarantee

or select another batch:


Customer Information