Date published: 2026-4-20

1-800-457-3801

SCBT Portrait Logo
Seach Input

U-0521 (CAS 5466-89-7)

0.0(0)
Write a reviewAsk a question

Application:
U-0521 is an extraneuronal COMT uptake inhibitor
CAS Number:
5466-89-7
Purity:
98%
Molecular Weight:
180.2
Molecular Formula:
C10H12O3
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

QUICK LINKS

U-0521 is an extraneuronal COMT (Catechol-O-methyltransferase) uptake inhibitor. This may act to decrease contractile responses in rat vas deferens. U-0521 is a potent inhibitor of catechol-O-methyltransferase (COMT), with the primary effect of increasing the accessibility and utilization of levodopa within the brain. By specifically targeting and inhibiting the activity of catechol-O-methyltransferase, U-0521 plays a role in enhancing the efficacy of levodopa.


U-0521 (CAS 5466-89-7) References

  1. Altered inotropic and chronotropic effects of noradrenaline on isolated rat atria exposed to chagasic sera. Influences of cocaine, normetanephrine and U-0521 (3'-4'-dihydroxy-2-methyl propiophenone.  |  Gimeno, AL., et al. 1979. Cardiovasc Res. 13: 723-31. PMID: 119577
  2. Activation of myocardial beta-adrenoceptors by the nitrogen-free low affinity ligand 3',4'-dihydroxy-alpha-methylpropiophenone (U-0521).  |  Kaumann, AJ., et al. 1977. Naunyn Schmiedebergs Arch Pharmacol. 296: 217-28. PMID: 14306
  3. Altered metabolism of [18F]-6-fluorodopa in the hooded rat following inhibition of catechol-O-methyltransferase with U-0521.  |  Cumming, P., et al. 1987. Biochem Pharmacol. 36: 2527-31. PMID: 3111485
  4. Age-related changes in guinea pig respiratory tissues: considerations for assessment of bronchodilators.  |  Duncan, PG. and Douglas, JS. 1985. Eur J Pharmacol. 108: 39-48. PMID: 3979434
  5. Comparison of the effects of tropolone, beta-thujaplicin and U-0521 on the extraneuronal accumulation of isoprenaline in guinea-pig trachealis smooth muscle cells. A quantitative fluorescence histochemical study.  |  Bryan, LJ. and O'Donnell, SR. 1979. Naunyn Schmiedebergs Arch Pharmacol. 307: 235-41. PMID: 492345
  6. The catechol-O-methyl transferase activity and endogenous catecholamine content of various tissues in the rat and the effect of administration of U-0521 (3',4'-dihydroxy-2-methyl propiophenone).  |  Giles, RE. and Miller, JW. 1967. J Pharmacol Exp Ther. 158: 189-94. PMID: 5625691
  7. A comparison of 2-hydroxyestradiol and U-0521 (3'4'-dihydroxy-2-methylpropiophenone, Upjohn) as in situ and in vitro inhibitors of tyrosine hydroxylase.  |  Lloyd, T., et al. 1982. J Neurochem. 38: 948-54. PMID: 6121005
  8. Catechol-O-methyltransferase and Parkinson's disease.  |  Reches, A. and Fahn, S. 1984. Adv Neurol. 40: 171-9. PMID: 6695593
  9. A comparative study of the properties of the catechol-O-methyltransferase inhibitors, U-0521 and tropolone acetamide, in rat perfused heart.  |  Bryan, LJ., et al. 1983. Naunyn Schmiedebergs Arch Pharmacol. 322: 6-19. PMID: 6843690
  10. Catechol-O-methyltransferase inhibition by U-0521 increases striatal utilization of levodopa.  |  Reches, A., et al. 1982. Naunyn Schmiedebergs Arch Pharmacol. 320: 34-7. PMID: 7121609
  11. Effect of 3',4'-dihydroxy-2-methyl-propriophenone (U-0521) on catechol-O-methyltransferase activity and on DOPA accumulation in rat red blood cells and corpus striatum.  |  Reches, A., et al. 1982. Biochem Pharmacol. 31: 3415-8. PMID: 7150363
  12. The antihypertensive effect of U-0521 (3',4'-dihydroxy-2-methylpropiophenone).  |  Lloyd, T. and Waldman, CD. 1982. Life Sci. 31: 2121-7. PMID: 7176811
  13. Extraneuronal uptake inhibitor U-0521 decreases contractile responses in rat vas deferens.  |  Rice, PJ., et al. 1997. Gen Pharmacol. 29: 437-9. PMID: 9378252

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

U-0521, 20 mg

sc-200745
20 mg
$120.00

U-0521, 100 mg

sc-200745A
100 mg
$306.00