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L6545

Sigma-Aldrich

Letrozole

≥98% (HPLC)

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Synonym(s):
4,4′-(1H-1,2,4-Triazol-1-ylmethylene)bisbenzonitrile
Empirical Formula (Hill Notation):
C17H11N5
CAS Number:
Molecular Weight:
285.30
MDL number:
PubChem Substance ID:

Quality Level

assay

≥98% (HPLC)

form

powder

color

white to off-white

solubility

DMSO: >50 mg/mL

originator

Novartis

storage temp.

2-8°C

SMILES string

N#CC(C=C1)=CC=C1C(N2C=NC=N2)C3=CC=C(C#N)C=C3

InChI

1S/C17H11N5/c18-9-13-1-5-15(6-2-13)17(22-12-20-11-21-22)16-7-3-14(10-19)4-8-16/h1-8,11-12,17H

InChI key

HPJKCIUCZWXJDR-UHFFFAOYSA-N

Gene Information

human ... CYP19A1(1588)

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Application

Letrozole has been used:
  • in organoid growth assay to determine its inhibitory capacity(48)
  • to investigate steroid receptor coactivator-1 (SRC-1) mediated endogenous estrogen regulation of hippocampal PSD-95(49)
  • to determine its effects on tumor-induced hyperalgesia(50)
  • for hormonal manipulation in rats(51)
  • to study its effects on lipocalin-2 (Lcn2)(52)
  • to determine its effects on mechanical hyperalgesia and aromatase expression(53)

Biochem/physiol Actions

Letrozole acts as an adjuvant agent and is used to treat breast cancer.
Letrozole is a third generation nonsteroidal aromatase inhibitor. It is a competitive inhibitor of the aromatase enzyme system and thus inhibits the conversion of androgens to estrogens. Letrozole inhibits the aromatase enzyme by competitively binding to the heme of the cytochrome P450 subunit of the enzyme, resulting in a reduction of estrogen biosynthesis in all tissues.

Features and Benefits

This compound is featured on the Nuclear Receptors (Steroids) page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound was developed by Novartis. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.

pictograms

Health hazard

signalword

Warning

Hazard Classifications

Repr. 2 - STOT RE 2

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable


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