Add time:07/12/2019 Source:sciencedirect.com
GR89696, racemic methyl 4-[(3,4-dichlorophenyl)acetyl]-3-[(1-pyrrolidinyl) methyl]-1-piperazinecarboxylate, a kappa opioid receptor ligand, was labeled with [11C]methyl chloroformate. The radiochemical yield was 20% with an observed specific radioactivity of 75.5 GBq/μmol at end of synthesis (2,040 mCi/μmol). Five minutes after intravenous administration, 5.4% of the injected dose accumulated in mouse whole brain. Brain region to cerebellar ratios increased over time with ratios at 90 min of 7.8, 5.6, and 4.5 for the hypothalamus, olfactory tubercle, and striatum, respectively. The uptake of [11C]GR89696 correlated with known kappa opioid receptor densities and was inhibited by kappa opioid selective drugs.
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