9845
Amongst the compounds screened for antioxidant activity , thiosemicarbazones 4a , 4b and 4c showed good antioxidant activity on DPPH .
 Chemical: thiosemicarbazones; Chemical: DPPH
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: thiosemicarbazones; Chemical: DPPH