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The results indicated that the assay was reproducible and precise , and could be readily underutilised for the quality evaluation of tea flowers on the basis of polyphenols ' contents .
 Chemical: polyphenols
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyphenols