20886
Here , the main pathways were N - oxidation of the pyridine and / or pyrimidine ring and a ring contraction of the pyrimidine ring into an imidazole ring .
 Chemical: N; Chemical: pyridine; Chemical: pyrimidine; Chemical: pyrimidine; Chemical: imidazole
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: N, pyridine, pyrimidine, pyrimidine, imidazole 
Answer:
 Chemical: N; Chemical: pyridine; Chemical: pyrimidine; Chemical: pyrimidine; Chemical: imidazole