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Cat.No. 3588 - Estropipate | C18H22O5S.C4H10N2 | CAS No. 7280-37-7
Description: Estrogen receptor agonist and OATP1B1 inhibitor
Chemical Name: Piperazine estrone sulfate
Purity: ≥97% (HPLC)

Biological Activity

Estrogen receptor agonist. Also inhibits organic anion transporting polypeptide 1B1 (OATP1B1) (IC50= 70 nM).

Technical Data

M. Wt 436.56
Formula C18H22O5S.C4H10N2
Storage Store at RT
Purity ≥97% (HPLC)
CAS Number 7280-37-7
PubChem ID 5284555
Smiles O=C4CC[C@@]3([H])[C@]2([H])CCC1=CC(OS(=O)(O)=O)=CC=C1[C@]([H])2CC[C@@]34C.C5NCCNC5

The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.

All Tocris products are intended for laboratory research use only.

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
1.1eq. NaOH 43.66 100
DMSO 43.66 100
water 2.18 5

Preparing Stock Solutions

The following data is based on the product molecular weight 436.56. Batch specific molecular weights may vary from batch to batch due to solvent of hydration, which will affect the solvent volumes required to prepare stock solutions.

Select a batch to recalculate based on the batch molecular weight:
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 2.29 mL 11.45 mL 22.91 mL
5 mM 0.46 mL 2.29 mL 4.58 mL
10 mM 0.23 mL 1.15 mL 2.29 mL
50 mM 0.05 mL 0.23 mL 0.46 mL

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Product Datasheets

Safety Datasheet


References are publications that support the products' biological activity.

Williams et al (2004) Estrogen regulation of the cytochrome P450 3A subfamily in humans. J.Pharmacol.Exp.Ther. 311 728 PMID: 15282264

Obaidat et al (2009) A cell-based high-throughput assay to identify inhibitors of organic anion transporting polypeptides 1B1 and 1B3. FASEB J. 23 748 PMID:

If you know of a relevant reference for Estropipate, please let us know.

View Related Products by Product Action

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Keywords: Estropipate, supplier, Estrogen, receptor, agonists, OATP1B, inhibitors, inhibits, Estrogen, and, Related, Receptors, Tocris Bioscience

Citations for Estropipate

Citations are publications that use Tocris products.

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Literature in this Area


Cancer Research Product Guide

A collection of over 750 products for cancer research, the guide includes research tools for the study of:

  • Cancer Metabolism
  • Epigenetics in Cancer
  • Receptor Signaling
  • Cell Cycle and DNA Damage Repair
  • Angiogenesis
  • Invasion and Metastasis
Nuclear Receptors

Nuclear Receptors Product Listing

A collection of over 150 products for key nuclear receptors, the listing includes research tools for the study of:

  • Androgen Receptors
  • Estrogen Receptors
  • Retinoic Acid Receptors
  • Retinoid X Receptors
  • Vitamin D Receptors

Pathways for Estropipate


Estrogen Signaling Pathway

Estrogen is a steroid hormone that is responsible for the regulation of growth, differentiation and function of the reproductive system. Estrogen signaling is often dysregulated in breast cancer and osteoporosis.


TODO: Add Protocols