20143
Facile synthesis of silver nanoparticles stabilized by cationic polynorbornenes and their catalytic activity in 4 - nitrophenol reduction .
 silver, polynorbornenes, 4 - nitrophenol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 silver, polynorbornenes, 4 - nitrophenol