104-98-3 2-Propenoic acid, 3-(1H-imidazol-4-yl)- 3-(1H-Imidazol-4-yl)-2-propenoic acid 3-Imidazol-4-ylacrylic acid 4-25-00-00786 (Beilstein Handbook Reference) 4-Imidazoleacrylic acid 5-Imidazoleacrylic acid BRN 0081405 CCRIS 3414 EINECS 203-258-4 Imidazole-4-acrylic acid Imidazoleacrylic acid NSC 66357 UROCANIC ACID Urocaninic acid