24094
Previously , we demonstrated the cytotoxic effects of three new alpha - santonin derivatives on different tumor cell lines with low toxic effects upon peripheral human leukocytes .
 Chemical: alpha - santonin
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: alpha - santonin