11683
Compounds 1 , 3 , 5 , 12 , 14 , 15 and 16 showed antioxidant activity by an ABTS - based assay .
 Chemical: ABTS
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: ABTS