INTRODUCTION
The fused heterocyclic formed by fusion of pyrimidine and pyrrole rings, is a solid compound with a chromatographic purity of 98%.
It displays keto and enol isomers as is reflected in its synonyms and is an important biochemical reagent and a vital nucleobase.

Synonyms3,7-Dihydro pyrrole[2,3] pyrimidine-4-one Pyrrolo [2,3-d]pyrimidin-4-ol 7H-Pyrrolo[2,3-d]pyrimidin-4-ol
CAS no.3680-71-5
EINECS no.640-613-6
Molecular formulaC6H5N3O
Structure(download pdf to view)
Molecular weight135.12

APPLICATIONS
The product as such has medicinal properties and its therapeutic use is cited as prodrug of thymidine phosphorylase inhibitor.  Besides, it also finds use as a building block in the synthesis of API’s such as:

APITHERAPEUTIC CATEGORY
ClofarabineAnti-neoplastic, Anti-cancer
RuxolitinibAnti-cancer
TofacitinibAnti-cancer
BaricitinibAnti-cancer

It is also used in the manufacture of a series of value-added intermediates such as:

INTERMEDIATECAS#
4-Chloropyrrolo[2,3-d]pyrimidine3680-69-1
1,7-Dihydropyrrolo[2,3-d]pyrimidine-4-thione1421-27-8
4-Chloro-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine941685-26-3
4-chloro-7-(phenylsulfonyl)-7h-pyrrolo[2,3-d]-Pyrimidine186519-89-1

SPECIFICATIONS

TESTUNITSPECIFICATION
AppearanceWhite to Brown Solid
Identification
a. 1H NMRConforms to the structure
b. LCMSConforms to the structure
c. FTIRConforms to the structure
Purity by HPLC%NLT 98
MoistureWt. %NMT 0.5
Largest unspecified impurity%NMT 0.5

STORAGE
The product is stored at ambient temperature.

ExSyn offers this compound on commercial scale and welcomes enquiries. No matter the quantity you need, our exceptional quality and service will make ExSyn your supplier of choice! If you need any additional information or SDS, please get in touch with us.



More Products in focus
In focus: Blown Castor Oil (15-17 Poise)
Products in focus · 10/03/2026

Blown Castor Oil (15-17 Poise) is a modified grade of Castor oil. The “15-17 Poise” specification refers to its viscosity range, indicating a medium-viscosity blown oil suitable for industrial applications requiring improved body, tackiness, and elasticity compared to regular castor oil.

READ MORE
In focus: Dimethyl Amino Ethanol (DMAE)
Products in focus · 03/03/2026

Dimethylaminoethanol (DMAE) is a is a tertiary amine that is ethanolamine having two N-methyl substituents. It is clear & colourless to pale yellow liquid with ammoniacal odor.  DMAE is stable at room temperature and is completely miscible with water as well as organic solvents such as alcohols and ethers. It decomposes at high temperatures. It is a versatile chemical intermediate primarily used as a curing agent for polyurethane foams and epoxy resins.

READ MORE
In focus: 1,4,7-Trimethyl-1,4,7-triazonane (Me₃TACN)
Products in focus · 24/02/2026

1,4,7-Trimethyl-1,4,7-triazonane (Me₃TACN) is a valuable macrocyclic tridentate ligand derived from 1,4,7-triazacyclononane. In Me₃TACN, each nitrogen atom is substituted with a methyl group, which significantly modifies its steric and electronic properties. Me₃TACN is widely used as a ligand in coordination chemistry due to its ability to form stable complexes with transition metals such as Cu, Ni, Fe, Mn, and Zn.

READ MORE
In focus: Adenosine
Products in focus · 17/02/2026

Adenosine is a naturally occurring purine nucleoside composed of adenine and ribose, present in all living cells. It plays a vital role in biochemical processes such as energy transfer (ATP/ADP), signal transduction, and regulation of physiological functions, and is widely used in pharmaceutical applications.

READ MORE
In focus: Methyl-2- Methoxy-5-Sulfamoyl Benzoate
Products in focus · 10/02/2026

Methyl-2-Methoxy-5-Sulfamoyl Benzoate (MSMB) is a sulfur containing organic building block acting as a chemical intermediate. MSMB contains ester and sulfamoyl functional groups, which make it useful as a pharmaceutical and fine-chemical intermediate.

READ MORE
In focus: Imidazolidinyl Urea
Products in focus · 03/02/2026

Imidazolidinyl urea is a widely used antimicrobial preservative in the cosmetic and personal care industry. It is a formaldehyde-releasing compound that effectively inhibits the growth of bacteria, yeast, and molds, thereby extending the shelf life of formulations. Due to its broad-spectrum efficacy and cost-effectiveness, it is commonly used in rinse-off and leave-on products within regulated concentration limits.

READ MORE
In focus: 2-Cyanoethyl tetraisopropylphosphorodiamidite
Products in focus · 20/01/2026

Phosphorodiamidites are a unique class of phosphorus-based compounds characterized by one P–O bond and two P–N moieties. 2-Cyanoethyl tetraisopropylphosphorodiamidite plays a crucial role in solid-phase oligonucleotide synthesis. Beyond their application as synthetic precursors for oligonucleotides, phosphorodiamidites have also been reported as valuable starting materials for the synthesis of industrially relevant polymers and flame-resistant materials, including adhesives, coatings, and laminates.

READ MORE
In focus: Ferric Maltol
Products in focus · 13/01/2026

Ferric maltol is an oral iron complex composed of ferric iron (Fe³⁺) chelated with maltol, designed to improve iron absorption while reducing common gastrointestinal side effects associated with traditional iron salts. It is primarily used in the management of iron deficiency with better tolerability.

READ MORE
In focus: Phosphatidylcholine 90% from Soya Lecithin
Products in focus · 09/12/2025

Phosphatidylcholine (PC) is one of the most important phospholipids derived from soya lecithin and represents a key structural component of cell membranes. Phosphatidylcholine 90% refers to a highly purified grade where the PC content is enriched to around 90% through specialized extraction and purification steps.

READ MORE