18391
Oxazolidinone ring substitution on the pyridyl ring generated analogues with antibacterial activity superior to imidazolidinone ring .
 Oxazolidinone, pyridyl, imidazolidinone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Oxazolidinone, pyridyl, imidazolidinone