23341
All the alkaloids were in vitro evaluated for their cytotoxic activities against eight tumor cell lines ( BEN - MEN - 1 , CCF - STTG1 , CHG - 5 , SHG - 44 , U251 , BGC - 823 , HepG2 , and SK - OV - 3 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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