21508
In a side reaction that is separate from the bioreductive metabolism of 1 , xanthine oxidase converted 1 to 6 - nitroquinolin - 2 ( 1H ) - one ( 5 ) .
 Chemical: xanthine; Chemical: 6 - nitroquinolin - 2 ( 1H ) - one
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: xanthine, 6 - nitroquinolin - 2 ( 1H ) - one 
Answer:
 Chemical: xanthine; Chemical: 6 - nitroquinolin - 2 ( 1H ) - one