13230
Two derivatives of naphthoquinone ( 9b and 9c ) exhibited potent activity against Trypanosoma brucei in vitro with low cytotoxicity .
 Chemical: naphthoquinone
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: naphthoquinone