imidazolyl carboxylic acid 1-[(1R)-1-phenylethyl]-1H-imidazole-5-carboxylic acid Ethylbenzene in which the <em>pro</em>-<i>R</i> α-hydrogen is substituted by the nitrogen at the 1 position of 1<em>H</em>-imidazole-5-carboxylic acid. Its ethyl ester, etomidate, is used as an intravenous anaesthetic. CHEBI:60458