25662
The 2 , 2 - diphenyl - 1 - picrylhydrazyl method , was used to compare free radical scavenging ability .
 Chemical: 2 , 2 - diphenyl - 1 - picrylhydrazyl
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: 2 , 2 - diphenyl - 1 - picrylhydrazyl 
Answer:
 Chemical: 2 , 2 - diphenyl - 1 - picrylhydrazyl