2-Thiophenecarboxylic acid, 5-(aminocarbonyl)-1H-imidazol-4-yl ester 5-(Aminocarbonyl)-1H-imidazol-4-yl 2-thiophenecarboxylate 5-Carbamoyl-1H-imidazole-4-yl thiophene-2'-carboxyate 77444-67-8