Ent-3-Methoxy-9a-Methylmorphinan

CAS Number:6700‑34‑1

Synonyms: ent‑3‑Methoxy‑9a‑methyl‑17‑methylmorphinan hydrobromide monohydrate; Dextromethorphan HBr monohydrate; (+)-3-Methoxy-N‑methylmorphinan hydrobromide monohydrate

Chemical Formula:C₁₈H₂₅NO · HBr · H₂O

Molecular Weight:≈ 370.32 g/mol

Product Introduction

A white to off‑white crystalline powder (≥ 99% assay), this hydrobromide monohydrate of dextromethorphan is used as a USP/EP reference standard and is the active ingredient in OTC antitussive medications.

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Physical & Chemical Properties

Property Value
Appearance White to slightly yellow crystalline powder
Assay (Anhydrous) 99.0–101.0 % (USP/Ph. Eur.)
Melting Point ~125 °C (with decomposition)
Solubility Sparingly soluble in water; freely soluble in ethanol (~750 g/L)
Optical Rotation +27–+30° (20 °C, water)
Storage Light‑protected containers, cool conditions

Applications

  • Pharma reference standard: For assay calibration, method validation, QC (USP, EP).
  • OTC antitussive API: Active component in cough medicines.
  • Research tool: Studied for NMDA‑receptor antagonism and neurological effects.

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