20644
Preliminary screening of the compounds involved scavenging hydroxyl radicals and 2 , 2 - diphenyl - 1 - picrylhydrazyl ( DPPH ( . ) ) , croton oil - induced ear edema in mice , and analysis of the mRNA expression of adhesion molecules in ECs .
 Chemical: hydroxyl; Chemical: 2 , 2 - diphenyl - 1 - picrylhydrazyl; Chemical: DPPH ( . )
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: hydroxyl, 2 , 2 - diphenyl - 1 - picrylhydrazyl, DPPH ( . ) 
Answer:
 Chemical: hydroxyl; Chemical: 2 , 2 - diphenyl - 1 - picrylhydrazyl; Chemical: DPPH ( . )