26095
The activities of PA as anti - Helicobacter pylori , cyclooxygenase - 2 ( COX - 2 ) inhibitor and free radical scavenger were also investigated in vitro .
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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:
 None