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

MedKoo CAT#: 510233

CAS#: 449811-01-2

Description: Pamapimod is a novel p38 mitogen-activated protein kinase inhibitor. Pamapimod inhibited p38alpha and p38beta enzymatic activity, with IC(50) values of 0.014 +/- 0.002 and 0.48 +/- 0.04 microM, respectively. There was no activity against p38delta or p38gamma isoforms. When profiled across 350 kinases, pamapimod bound only to four kinases in addition to p38. Cellular potency was assessed using phosphorylation of heat shock protein-27 and c-Jun as selective readouts for p38 and c-Jun NH(2)-terminal kinase (JNK), respectively. Pamapimod inhibited p38 (IC(50), 0.06 microM), but inhibition of JNK was not detected. Pamapimod also inhibited lipopolysaccharide (LPS)-stimulated tumor necrosis factor (TNF) alpha production by monocytes, interleukin (IL)-1beta production in human whole blood, and spontaneous TNFalpha production by synovial explants from RA patients. Pamapimod is a potent, selective inhibitor of p38alpha with the ability to inhibit the signs and symptoms of RA and other autoimmune diseases. (copied from J Pharmacol Exp Ther. 2008 Dec;327(3):610-9.)

Chemical Structure

CAS# 449811-01-2

Theoretical Analysis

MedKoo Cat#: 510233
Name: Pamapimod
CAS#: 449811-01-2
Chemical Formula: C19H20F2N4O4
Exact Mass: 406.14526
Molecular Weight: 406.38
Elemental Analysis: C, 56.15; H, 4.96; F, 9.35; N, 13.79; O, 15.75

Price and Availability

Size Price Availability Quantity
50.0mg USD 450.0 2-3 months
100.0mg USD 750.0 2-3 months
200.0mg USD 1450.0 2-3 months
500.0mg USD 2150.0 2-3 months
1.0g USD 3250.0 2-3 months
2.0g USD 4850.0 2-3 months
5.0g USD 7650.0 2-3 months
Bulk inquiry

Synonym: Pamapimod; R 1503; R1503; R-1503; Ro 4402257; Ro4402257; Ro-4402257.

IUPAC/Chemical Name: 6-(2,4-Difluorophenoxy)-2-[[3-hydroxy-1-(2-hydroxyethyl)propyl]amino]-8-methylpyrido[2,3-d]pyrimidin-7(8H)-one


InChi Code: InChI=1S/C19H20F2N4O4/c1-25-17-11(10-22-19(24-17)23-13(4-6-26)5-7-27)8-16(18(25)28)29-15-3-2-12(20)9-14(15)21/h2-3,8-10,13,26-27H,4-7H2,1H3,(H,22,23,24)


Appearance: white solid powder

Purity: >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).

Solubility: 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: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 406.38 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.

Recalculate based on batch purity %
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

Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Dilution Calculator

Calculate the dilution required to prepare a stock solution.

1: Zhang X, Fettner S, Winter E, Masjedizadeh M, Hisoire G. Metabolism and excretion of a novel p38 MAP kinase inhibitor pamapimod in healthy male subjects. Int J Clin Pharmacol Ther. 2011 Jun;49(6):345-52. PubMed PMID: 21612741.

2: Goldstein DM, Soth M, Gabriel T, Dewdney N, Kuglstatter A, Arzeno H, Chen J, Bingenheimer W, Dalrymple SA, Dunn J, Farrell R, Frauchiger S, La Fargue J, Ghate M, Graves B, Hill RJ, Li F, Litman R, Loe B, McIntosh J, McWeeney D, Papp E, Park J, Reese HF, Roberts RT, Rotstein D, San Pablo B, Sarma K, Stahl M, Sung ML, Suttman RT, Sjogren EB, Tan Y, Trejo A, Welch M, Weller P, Wong BR, Zecic H. Discovery of 6-(2,4-difluorophenoxy)-2-[3-hydroxy-1-(2-hydroxyethyl)propylamino]-8-methyl-8H-p yrido[2,3-d]pyrimidin-7-one (pamapimod) and 6-(2,4-difluorophenoxy)-8-methyl-2-(tetrahydro-2H-pyran-4-ylamino)pyrido[2,3-d]py rimidin-7(8H)-one (R1487) as orally bioavailable and highly selective inhibitors of p38α mitogen-activated protein kinase. J Med Chem. 2011 Apr 14;54(7):2255-65. doi: 10.1021/jm101423y. Epub 2011 Mar 4. PubMed PMID: 21375264.

3: Doggrell SA, Christensen AM. Does the p38 MAP kinase inhibitor pamapimod have potential for the treatment of rheumatoid arthritis? Expert Opin Pharmacother. 2010 Oct;11(14):2437-42. doi: 10.1517/14656566.2010.507631. PubMed PMID: 20666701.

4: Zhang X, Huang Y, Navarro MT, Hisoire G, Caulfield JP. A proof-of-concept and drug-drug interaction study of pamapimod, a novel p38 MAP kinase inhibitor, with methotrexate in patients with rheumatoid arthritis. J Clin Pharmacol. 2010 Sep;50(9):1031-8. doi: 10.1177/0091270009357433. Epub 2010 Jan 25. PubMed PMID: 20100913.

5: Alten RE, Zerbini C, Jeka S, Irazoque F, Khatib F, Emery P, Bertasso A, Rabbia M, Caulfield JP. Efficacy and safety of pamapimod in patients with active rheumatoid arthritis receiving stable methotrexate therapy. Ann Rheum Dis. 2010 Feb;69(2):364-7. doi: 10.1136/ard.2008.104802. Epub 2009 Apr 8. Erratum in: Ann Rheum Dis. 2011 Aug;70(8):1519. PubMed PMID: 19357113.

6: Cohen SB, Cheng TT, Chindalore V, Damjanov N, Burgos-Vargas R, Delora P, Zimany K, Travers H, Caulfield JP. Evaluation of the efficacy and safety of pamapimod, a p38 MAP kinase inhibitor, in a double-blind, methotrexate-controlled study of patients with active rheumatoid arthritis. Arthritis Rheum. 2009 Feb;60(2):335-44. doi: 10.1002/art.24266. PubMed PMID: 19180516.

7: Hill RJ, Dabbagh K, Phippard D, Li C, Suttmann RT, Welch M, Papp E, Song KW, Chang KC, Leaffer D, Kim YN, Roberts RT, Zabka TS, Aud D, Dal Porto J, Manning AM, Peng SL, Goldstein DM, Wong BR. Pamapimod, a novel p38 mitogen-activated protein kinase inhibitor: preclinical analysis of efficacy and selectivity. J Pharmacol Exp Ther. 2008 Dec;327(3):610-9. doi: 10.1124/jpet.108.139006. Epub 2008 Sep 5. PubMed PMID: 18776065.

Additional Information