16805
The results indicate that abstraction of a hydrogen atom ( by live polymer chains ) from the methyl group in methyl acrylate , the methylene group in ethyl acrylate , and methylene groups in n - butyl acrylate are the most likely mechanisms of CTM .
 hydrogen, methyl, methyl acrylate, methylene, ethyl acrylate, methylene, n - butyl acrylate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 hydrogen, methyl, methyl acrylate, methylene, ethyl acrylate, methylene, n - butyl acrylate