trans-urocanate -1 137.03565 137.118 chebi_ontology C6H5N2O2 O=C([O-])/C=C/c1cncn1 CHEBI:15298 (2E)-3-(1H-imidazol-4-yl)prop-2-enoate CHEBI:17771 (E)-3-(imidazol-4-yl)propenoate A urocanate obtained by deprotonation of the carboxy group of <i>trans</i>-urocanic acid; major species at pH 7.3. LOIYMIARKYCTBW-OWOJBTEDSA-M InChI=1S/C6H6N2O2/c9-6(10)2-1-5-3-7-4-8-5/h1-4H,(H,7,8)(H,9,10)/p-1/b2-1+ (2E)-3-(1H-imidazol-4-yl)prop-2-enoate reaxys:5735282 trans-urocanate carboxylic acid anion