CAS No. 5633-20-5

Batch: Purity:99.96
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Oxybutynin Chemical Structure
Chemical Structure
Check the Oxybutynin product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name 4-(diethylamino)but-2-ynyl 2-cyclohexyl-2-hydroxy-2-phenylacetate
CAS Number 5633-20-5
Molecular Formula

C22H31NO3
Molecular Weight (MW) 357.49
SMILES CCN(CC)CC#CCOC(=O)C(C1CCCCC1)(C2=CC=CC=C2)O
InChIKey XIQVNETUBQGFHX-UHFFFAOYSA-N

Ordering Information

Biological Activity

Oxybutynin is a competitive antagonist of M1, M2, and M3 muscarinic acetylcholine receptors. By blocking muscarinic receptor signaling, it inhibits acetylcholine-stimulated smooth muscle contraction in the urinary bladder. This antagonism reduces detrusor muscle spasms and suppresses involuntary bladder contractions, thereby serving as a valuable research tool for studying cholinergic pathway regulation in urinary tract disorders. [1]

How to Prepare Stock Solution?

Concentration Volume Mass
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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 71 mg/mL (198.6 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Ethanol 71 mg/mL
Water Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).

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Note: Technical data last updated: Sep 1, 2026.