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Studies on the bioactivity of aqueous extract of pu - erh tea and its fractions : in vitro antioxidant activity and alpha - glycosidase inhibitory property , and their effect on postprandial hyperglycemia in diabetic mice .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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