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Laccase and peroxidase induced the polymerization of syringic acid to give a poly ( 1,4-phenylene oxide ) bearing a carboxylic acid at one end and a phenol ic hydroxyl group at the other .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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