Small molecules & peptides

GR 89696 fumarate

Reference standard for (R)-(–)-[¹¹C]GR 103545 and (S)-(+)-[¹¹C]GR 103545

GR 89696 fumarate salt; 4-[(3,4-dichlorphenyl)acetyl]-3-(1-pyrrolidinylmethyl)-1-piperazinecarboxylic acid methyl ester fumarate

CA index name: 1-Piperazinecarboxylic acid, 4-[(3,4-dichlorphenyl)acetyl]-3-(1-pyrrolidinylmethyl)-, methyl ester, (E)-2-butenedioate (1:1)


Research Chemical


Molar mass 530.40

CAS RN [126766-32-3]

Purity ≥ 95 %

  • Off-white solid


CoA: appearance, ¹H and ¹³C NMR spectra


Ravert H.T. et al. [¹¹C]-GR 89696, a potent kappa opiate receptor radioligand, in vivo binding of the R and S enantiomers. Nuc. Med. Biol. 2002, 29, 47–53.

Talbot P.S. et al. ¹¹C-GR 103545, a Radiotracer for Imaging κ-Opioid Receptors In Vivo with PET: Synthesis and Evaluation in Baboons. J. Nucl. Med. 2005, 46, 484–494.

Naylor A. et al. A Potent New class of κ-Receptor Agonist: 4-Substituted 1-(Arylacetyl)-2-[(dialkylamino)methyl]piperazines. J. Med. Chem. 1993, 36, 2075–2083.

Schoultz B.W. et al. A New Method for Radiosynthesis of ¹¹C-Labeled Carbamate Groups and its Application for a Highly Efficient Synthesis of the Kappa-Opioid Receptor Tracer [¹¹C]GR 103545. The Open Med. Chem. J. 2008, 2 ,72–74.

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