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Estriol

Estriol Impurities & Reference Standards

Estriol, supplied as a certified reference standard, is an active pharmaceutical ingredient (API) central to pharmaceutical formulation and drug product manufacturing. Estriol is registered under CAS Number 50-27-1. The compound carries the molecular formula C18H24O3, corresponding to a molecular weight of 288.4 g/mol. High-purity Estriol and its related substances / process impurities are essential for analytical method development, method validation, quality control, and regulatory submissions under ICH, USP, BP, and EP guidelines. Each batch of Estriol reference standard is accompanied by a Certificate of Analysis (CoA), HPLC purity data, and spectroscopic (NMR/MS/IR) characterization for use in pharmaceutical laboratories worldwide.

Associated Impurities

Estriol Impurity – A

  • CAS No: 246021-20-5
  • Mol. F.: C18H22O3

Estriol Impurity – B

  • CAS No: 53-16-7
  • Mol. F.: C18H22O2

Estriol Impurity – C

  • CAS No: 1474-53-9
  • Mol. F.: C19H26O3

Estriol Impurity – D

  • CAS No: 50-28-2
  • Mol. F.: C18H24O2

Estriol Impurity – E

  • CAS No: 1228-72-4
  • Mol. F.: C18H24O3

Estriol Impurity – F

  • CAS No: 547-81-9
  • Mol. F.: C18H24O3

Estriol Impurity – G

  • CAS No: 793-89-5
  • Mol. F.: C18H24O3

Estriol Impurity – H

  • CAS No: 566-76-7
  • Mol. F.: C18H22O3

Estriol Impurity – I

  • CAS No:
  • Mol. F.:

Estriol Impurity – J

  • CAS No: 57-91-0
  • Mol. F.: C18H24O2

Estriol Impurity – K

  • CAS No: 901-93-9
  • Mol. F.: C20H24O3
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