20889
In conclusion , we discovered an unusual metabolic pathway of aryl - pyrimidine - containing compounds by a ring - opening reaction followed by elimination of a carbon atom and a ring closure to form an imidazole ring .
 Chemical: aryl - pyrimidine; Chemical: carbon; Chemical: imidazole
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: aryl - pyrimidine; Chemical: carbon; Chemical: imidazole