Imlunestrant

Chemical Information
Imlunestrant is a brain-penetrant selective estrogen receptor antagonist and degrader. The FDA approved imlunestrant on September 25, 2025 as a treatment for estrogen receptor (ER)-positive, HER2-negative, estrogen receptor 1 (ESR1)-mutated advanced or metastatic breast cancer with progression on at least one line of endocrine therapy. Imlunestrant works by antagonizing ER transcriptional activity and, by forming an unstable drug-receptor complex, promotes ER degradation via the ubiquitin-proteasome pathway. In clinical trials, imlunestrant has been investigated as monotherapy and in combination with other drugs in breast cancer patients.
| CAS Number | 2408840-26-4 |
| PubChem CID | 146603228 |
| IUPAC Name | (5R)-5-[4-[2-[3-(fluoromethyl)azetidin-1-yl]ethoxy]phenyl]-8-(trifluoromethyl)-5H-chromeno[4,3-c]quinolin-2-ol |
| Molecular Formula | C29H24F4N2O3 |
| Molecular Weight | 524.5 |
| XLogP | 6 |
| Topological Polar Surface Area | 54.8 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 9 |
| Rotatable Bond Count | 6 |
| Heavy Atom Count | 38 |
| Formal Charge | 0 |
| Complexity | 788 |
| Property | Value |
|---|---|
| Molecular Weight | 524.5 |
| XLogP3 | 6 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 9 |
| Rotatable Bond Count | 6 |
| Exact Mass | 524.17230528 |
| Monoisotopic Mass | 524.17230528 |
| Topological Polar Surface Area | 54.8 Ų |
| Heavy Atom Count | 38 |
| Formal Charge | 0 |
| Complexity | 788 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 1 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
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