CAS No. 162011-90-7

Batch: Purity:99.88
Rofecoxib  Chemical Structure
Chemical Structure
Check the Rofecoxib product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name 3-(4-methylsulfonylphenyl)-4-phenyl-2H-furan-5-one
CAS Number 162011-90-7
Molecular Formula

C17H14O4S

Molecular Weight (MW) 314.36
SMILES CS(=O)(=O)C1=CC=C(C=C1)C2=C(C(=O)OC2)C3=CC=CC=C3
InChIKey RZJQGNCSTQAWON-UHFFFAOYSA-N

Ordering Information

Biological Activity

Rofecoxib (MK-0966) is a potent and selective cyclooxygenase-2 (COX-2) inhibitor with an IC50 of 18 nM. By selectively inhibiting COX-2 activity, it blocks the conversion of arachidonic acid to prostaglandin E2 (PGE2) without significantly altering COX-1 function. This suppression of prostaglandin synthesis suppresses downstream inflammatory signaling pathways, leading to reduced cellular inflammation and pain signaling responses in preclinical cell and animal models. [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 63 mg/mL (200.4 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water Insoluble
Ethanol 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.