10423
A series of anthra [ 1 , 2 - d ] imidazole - 6 , 11 - dione derivatives were synthesized and evaluated for telomerase inhibition , hTERT expression and suppression of cancer cell growth in vitro .
 Chemical: anthra [ 1 , 2 - d ] imidazole - 6 , 11 - dione
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: anthra [ 1 , 2 - d ] imidazole - 6 , 11 - dione