Tipiracil

Also known as: 5-Chloro-6-[(2-imino-1-pyrrolidinyl)methyl]-2,4(1H,3H)-pyrimidinedione, 5-Chloro-6-((2-iminopyrrolidin-1-yl)methyl)pyrimidine-2,4(1H,3H)-dione, 5-chloro-6-[(2-iminopyrrolidin-1-yl)methyl]-1H-pyrimidine-2,4-dione, MA 1 (pharmaceutical), TPI, UNII-NGO10K751P

Tipiracil (CAS 183204-74-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H11ClN4O2 and a molecular weight of 242.662 g/mol. Key property: a density of 1.7±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 183204-74-2
Jingsj CID: J-1971233-6
Molecular Formula: C₉H₁₁ClN₄O₂
Molecular Weight: 242.662 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Density	1.7±0.1 g/cm3
Exact Mass	242.057053
PSA	93.33000
LogP	-1.37
Refractive Index	1.743
Storage Conditions	2-8℃

Activity & Biological Data

Target	thymidine phosphorylase[1]
Additional Information	[1]. Lee SJ, et al. Thymidine phosphorylase influences [(18)F]fluorothymidine uptake in cancer cells and patients with non-small cell lung cancer. Eur J Nucl Med Mol Imaging. 2014 Jul;41(7):1327-35. [2]. Raedler LA. Lonsurf (Trifluridine plus Tipiracil): A New Oral Treatment Approved for Patients with Metastatic Colorectal Cancer. Am Health Drug Benefits. 2016 Mar;9(Spec Feature):97-100. [3]. Tanaka N, et al. Repeated oral dosing of TAS-102 confers high trifluridine incorporation into DNA and sustained antitumor activity in mouse models. Oncol Rep. 2014 Dec;32(6):2319-26.

Target

thymidine phosphorylase[1]

Additional Information

[1]. Lee SJ, et al. Thymidine phosphorylase influences [(18)F]fluorothymidine uptake in cancer cells and patients with non-small cell lung cancer. Eur J Nucl Med Mol Imaging. 2014 Jul;41(7):1327-35. [2]. Raedler LA. Lonsurf (Trifluridine plus Tipiracil): A New Oral Treatment Approved for Patients with Metastatic Colorectal Cancer. Am Health Drug Benefits. 2016 Mar;9(Spec Feature):97-100. [3]. Tanaka N, et al. Repeated oral dosing of TAS-102 confers high trifluridine incorporation into DNA and sustained antitumor activity in mouse models. Oncol Rep. 2014 Dec;32(6):2319-26.

Frequently Asked Questions

What is the CAS number of Tipiracil?

The CAS number of Tipiracil is 183204-74-2.

What are the molecular formula and molecular weight of Tipiracil?

Tipiracil has molecular formula C9H11ClN4O2 and molecular weight 242.662 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Tipiracil (CAS 183204-74-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1971233-6 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.