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Six of the analogues showed potent cytotoxicity towards these cell lines with IC ( 50 ) values below 1 mu M , which is better than doxorubicin , a US FDA approved drug .
 Chemical: doxorubicin
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: doxorubicin