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However , UV irradiation in the C4 - C - N - PEG9 incorporated system causes one - dimensional micellar growth .
 C4 - C - N - PEG9
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 C4 - C - N - PEG9