6451
The present review provides recent antioxidant activities covering in vivo and in vitro studies of natural and synthetic analogues , as well as the proposed mechanisms of action and structure - activity relationships .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None