20387
These compounds ( 1 - 5 ) were evaluated for the antioxidant activity in 1 , 1 - diphenyl - 2 - picrylhydrazyl assay system .
 Chemical: 1 , 1 - diphenyl - 2 - picrylhydrazyl
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: 1 , 1 - diphenyl - 2 - picrylhydrazyl