20377
To investigate the antioxidant activity we used Trolox equivalent antioxidant capacity , oxygen radical absorbance capacity , Fe ( 2 + ) chelation activity and the inhibition of Fe ( 2 + ) - induced lipid peroxidation in mouse brain homogenates ( in vitro ) .
 Chemical: Trolox; Chemical: oxygen; Chemical: Fe ( 2 + ); Chemical: Fe ( 2 + )
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: Trolox; Chemical: oxygen; Chemical: Fe ( 2 + ); Chemical: Fe ( 2 + )