Small molecules & peptides


Precursor for [¹¹C]Metomidate and [¹¹C]Etomidate, and (R)-[¹⁸F]FETO ((R)-[¹⁸F]fluoroethyletomidate)

(R)-(+)-1-(1-Phenylethyl)-1H-imidazole-5-carboxylic acid; 1H-Imidazole-5-carboxylic acid, 1-(1-phenylethyl)-, (R)-; 1H-Imidazole-5-carboxylic acid, 1-[(1R)-1-phenylethyl]-; R28141

CA index name: 1H-Imidazole-5-carboxylic acid, 1-[(1R)-1-phenylethyl]-


Research Chemical


Molar mass 216.24

CAS RN [56649-48-0]

Purity ≥ 95 %

  • Off-white solid


CoA: appearance, ¹H NMR spectrum


Bergström M. et al. In Vitro and In Vivo Primate Evaluation of Carbon-11-Etomidate and Carbon-11-Metomidate as Potential Tracers for PET Imaging of the Adrenal Cortex and Its Tumors. J. Nucl. Med. 1998, 39, 982–989.

Wadsak W. et al. Synthesis of [¹⁸F]FETO, a novel potential 11-β hydroxylase inhibitor. J. Labelled Compd. Radiopharm. 2003, 46, 379–388.

Mitterhauser M. et al. In vivo and in vitro evaluation of [¹⁸F]FETO with respect to the adrenocortical and GABAergic system in rats. Eur. J. Nucl. Med. Mol. Imaging 2003, 30, 1398–1401.

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