23615
Employing ( 15 ) N - labeled 5 - bromouridine , no noticeable population of minor enol tautomers is found in the freonic mixture at 113 K .
 ( 15 ) N, 5 - bromouridine, enol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 15 ) N, 5 - bromouridine, enol