[11C]-GR89696, a potent kappa opiate receptor radioligand; in vivo binding of the R and S enantiomers

Hayden T. Ravert, Ursula Scheffel, William B Mathews, John L. Musachio, Robert F Dannals

Research output: Contribution to journalArticle


The R and S enantiomers of [11C]GR89696, [11C]-methyl 4-[(3,4-dichlorophenyl)acetyl]-3-[(1-pyrrolidinyl)methyl]-1- piperazinecarboxylate, were synthesized from their appropriate chiral precursors and [11C]methyl chloroformate. The [11C]-labeled R enantiomer of GR89696, also known as GR103545, demonstrated high affinity in mouse brain with region to cerebellar ratios at 90 minutes of 11.4 and 8.7 for the hypothalamus and olfactory tubercle, respectively. The [11C]-labeled S enantiomer showed low affinity and region to cerebellar ratios of 1 for all brain regions. The [11C]-labeled GR103545 exhibited a selective and saturable binding for the kappa opioid receptor.

Original languageEnglish (US)
Pages (from-to)47-53
Number of pages7
JournalNuclear Medicine and Biology
Issue number1
Publication statusPublished - 2002



  • C-11
  • GR103545
  • GR89696
  • Kappa opioid receptors
  • PET

ASJC Scopus subject areas

  • Cancer Research
  • Molecular Medicine
  • Radiology Nuclear Medicine and imaging

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