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

MedKoo CAT#: 401780

CAS#: 575474-82-7

Description: R112 is a Syk inhibitor. R112 inhibited degranulation induced by anti-IgE cross-linking in mast cells (tryptase release, effective concentration for 50% inhibition [EC(50)] = 353 nmol/L) or basophils (histamine release, EC(50) = 280 nmol/L), and by allergen (dust mite) in basophils (histamine release, EC(50) = 490 nmol/L). R112 also blocked leukotriene C4 production and all proinflammatory cytokines tested. Subsequent molecular characterization indicated that R112 is an ATP-competitive spleen tyrosine kinase (Syk) inhibitor (inhibitory constant [K(i)] = 96 nmol/L).

Chemical Structure

CAS# 575474-82-7

Theoretical Analysis

MedKoo Cat#: 401780
Name: R112
CAS#: 575474-82-7
Chemical Formula: C16H13FN4O2
Exact Mass: 312.10225
Molecular Weight: 312.3
Elemental Analysis: C, 61.53; H, 4.20; F, 6.08; N, 17.94; O, 10.25

Price and Availability

Size Price Availability Quantity
10.0mg USD 150.0 Ready to ship
25.0mg USD 250.0 Ready to ship
50.0mg USD 450.0 Ready to ship
100.0mg USD 750.0 Ready to ship
200.0mg USD 950.0 Ready to ship
500.0mg USD 1950.0 Ready to ship
1.0g USD 2950.0 2 weeks
2.0g USD 4350.0 2 weeks
5.0g USD 5950.0 2 weeks
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Synonym: R112; R112; R 112.

IUPAC/Chemical Name: 3,3'-((5-fluoropyrimidine-2,4-diyl)bis(azanediyl))diphenol


InChi Code: InChI=1S/C16H13FN4O2/c17-14-9-18-16(20-11-4-2-6-13(23)8-11)21-15(14)19-10-3-1-5-12(22)7-10/h1-9,22-23H,(H2,18,19,20,21)


Appearance: White to off 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 soluble in water.

Shelf Life: >5 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

Biological target: R112 is an ATP-competitive inhibitor of Syk kinase with a Ki of 96 nM.
In vitro activity: TBD
In vivo activity: TBD

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
DMSO 30.0 96.1

Preparing Stock Solutions

The following data is based on the product molecular weight 312.3 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
Formulation protocol: TBD
In vitro protocol: TBD
In vivo protocol: TBD

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1: Rossi AB, Herlaar E, Braselmann S, Huynh S, Taylor V, Frances R, Issakani SD, Argade A, Singh R, Payan DG, Masuda ES. Identification of the Syk kinase inhibitor R112 by a human mast cell screen. J Allergy Clin Immunol. 2006 Sep;118(3):749-55. Epub 2006 Jul 28. PubMed PMID: 16950297.

2: Guyer BJ, Shimamoto SR, Bradhurst AL, Grossbard EB, Dreskin SC, Nelson HS. Mast cell inhibitor R112 is well tolerated and affects prostaglandin D2 but not other mediators, symptoms, or nasal volumes in a nasal challenge model of allergic rhinitis. Allergy Asthma Proc. 2006 May-Jun;27(3):208-13. PubMed PMID: 16913263.

3: Meltzer EO, Berkowitz RB, Grossbard EB. An intranasal Syk-kinase inhibitor (R112) improves the symptoms of seasonal allergic rhinitis in a park environment. J Allergy Clin Immunol. 2005 Apr;115(4):791-6. PubMed PMID: 15806000.

4: Kang AK, Jenkins DJ, Wolever TM, Huff MW, Maguire GF, Connelly PW, Hegele RA. Apolipoprotein E R112; R251G: a carboxy-terminal variant found in patients with hyperlipidemia and coronary heart disease. Mutat Res. 1997 Sep;382(1-2):57-65. PubMed PMID: 9360638.


10.0mg / USD 150.0

Additional Information