Letrozole

Also known as: 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile, 1-[Bis(4-cyanophenyl)methyl]-1,2,4-triazole, CGS-20267, Femara, Femera, Lelrozol, Letoval, Letrozol, MFCD00866241, UNII-7LKK855W8I

Letrozole (CAS 112809-51-5) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C17H11N5 and a molecular weight of 285.31000 g/mol. Key properties include a melting point of 181-183ºC, a boiling point of 472.0±55.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 214.2±24.5 °C. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.

CAS No.: 112809-51-5
Jingsj CID: J-1980214-3
Molecular Formula: C₁₇H₁₁N₅
Molecular Weight: 285.31000 g/mol
Category: Organic Compounds
Last updated: 11/2/2026

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Physicochemical Properties

Melting Point	181-183ºC
Boiling Point	472.0±55.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	214.2±24.5 °C
Exact Mass	263.142242
PSA	78.29000
LogP	3.70
Vapor Pressure	0.0±1.2 mmHg at 25°C
Refractive Index	1.615
Storage Conditions	-20°C Freezer

Activity & Biological Data

Additional Information	[1]. Haynes, B.P., et al., The pharmacology of letrozole. J Steroid Biochem Mol Biol, 2003. 87(1): p. 35-45. [2]. Bhatnagar, A.S., et al., Highly selective inhibition of estrogen biosynthesis by CGS 20267, a new non-steroidal aromatase inhibitor. J Steroid Biochem Mol Biol, 1990. 37(6): p. 1021-7. [3]. Dellapasqua, S. and M. Colleoni, Letrozole. Expert Opin Drug Metab Toxicol, 2010. 6(2): p. 251-9. [4]. Lee, K., et al., An in vivo model of intratumoural aromatase using aromatase-transfected MCF7 human breast cancer cells. Int J Cancer, 1995. 62(3): p. 297-302.

Additional Information

[1]. Haynes, B.P., et al., The pharmacology of letrozole. J Steroid Biochem Mol Biol, 2003. 87(1): p. 35-45. [2]. Bhatnagar, A.S., et al., Highly selective inhibition of estrogen biosynthesis by CGS 20267, a new non-steroidal aromatase inhibitor. J Steroid Biochem Mol Biol, 1990. 37(6): p. 1021-7. [3]. Dellapasqua, S. and M. Colleoni, Letrozole. Expert Opin Drug Metab Toxicol, 2010. 6(2): p. 251-9. [4]. Lee, K., et al., An in vivo model of intratumoural aromatase using aromatase-transfected MCF7 human breast cancer cells. Int J Cancer, 1995. 62(3): p. 297-302.

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Letrozole?

The CAS number of Letrozole is 112809-51-5.

What are the molecular formula and molecular weight of Letrozole?

Letrozole has molecular formula C17H11N5 and molecular weight 285.31000 g/mol.

What are the upstream and downstream products of Letrozole?

For Letrozole, Upstream Products: 1H-1,2,4-triazole, 4-[alpha-(4-cyanophenyl)-chloromethyl]benzonitrile, 1,3,5-Triazine.

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

Last updated: 11/2/2026

How to cite: Jingsj. "Letrozole (CAS 112809-51-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1980214-3 (accessed 2026-11-09).

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