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The antioxidant potential of the isolated iridoids ( 1 - 4 ) was evaluated relative to conventionally used standards and these molecules exhibited good antioxidant potential .
 Chemical: iridoids
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: iridoids 
Answer:
 Chemical: iridoids