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From dibenzylamino ethanol , three heterofunctional PEGs with different molecular weights and labile amino termini were generated .
 dibenzylamino ethanol, PEGs, amino
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 dibenzylamino ethanol, PEGs, amino