20939
The in vitro cytotoxic activity of eighteen of the synthesized compounds was studied by brine shrimp lethality bioassay , and results indicated that compounds 6c , 13 , 3h , 6d and 3d have the highest cytotoxic activity .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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