17892
While a 5kgmol ( - 1 ) methoxy - terminated PEG corona prevents non - specific uptake , a 1 . 8kgmol ( - 1 ) methoxy - terminated PEG corona does not sufficiently protect the nanocarriers from nonspecific association .
 methoxy, PEG, methoxy, PEG
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 methoxy, PEG, methoxy, PEG