Catalog No. Size PriceQuantity
M7555-2 2mg solid $130
M7555-10 10mg solid $390


SAR439859 (compound 43d) is an orally available and nonsteroidal selective estrogen receptor degrader (SERD) with potential antineoplastic activity. SAR439859 is a potent estrogen receptor (ER) antagonist with EC50 of 0.2 nM for ERα degradation.

Product information

CAS Number: 2114339-57-8

Molecular Weight: 554.48

Formula: C31H30Cl2FNO3



SAR 439859

Chemical Name: 6-(2,4-Dichlorophenyl)-5-[4-[(3S)-1-(3-fluoropropyl)pyrrolidin-3-yl]oxyphenyl]-8,9-dihydro-7H-benzo[7]annulene-2-carboxylic acid

Smiles: OC(=O)C1=CC2CCCC(=C(C=2C=C1)C1C=CC(=CC=1)O[C@@H]1CN(CCCF)CC1)C1=CC=C(Cl)C=C1Cl


InChi: InChI=1S/C31H30Cl2FNO3/c32-23-8-12-27(29(33)18-23)28-4-1-3-21-17-22(31(36)37)7-11-26(21)30(28)20-5-9-24(10-6-20)38-25-13-16-35(19-25)15-2-14-34/h5-12,17-18,25H,1-4,13-16,19H2,(H,36,37)/t25-/m0/s1

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: DMSO: 100 mg/mL(180.34 mM).

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined

HS Tariff Code: 382200

How to use

In Vitro:

SAR439859 is a novel, orally bioavailable SERD with potent antagonist and degradation activities against both wild-type and mutant Y537S ER. Driven by its fluoropropyl pyrrolidinyl side chain, SAR439859 has demonstrated broader and superior ER antagonist and degrader activities across a large panel of ER+ cells, including inhibition of ER signaling and tumor cell growth.

In Vivo:

SAR439859 shows promising antitumor activity in breast cancer mice xenograft models. In vivo treatment with SAR439859 demonstrates significant tumor regression in ER+ breast cancer models, including MCF7-ESR1 wild-type and mutant-Y537S mouse tumors, and HCI013, a patient-derived tamoxifen-resistant xenograft tumor.


  1. Maysoun Shomali, et al. Mol Cancer Ther. 2021 Feb;20(2):250-262.
  2. Youssef El-Ahmad, et al. J Med Chem. 2020 Jan 23;63(2):512-528.

Products are for research use only. Not for human use.

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