8911
By a modified TRAP assay , some titled compounds were tested against telomerase , and compound 4a showed the most potent inhibitory activity with IC ( 50 ) value at 0 . 78 +/- 0 . 22 mu M .
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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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