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The present investigation suggests that an isovalerate moiety in feroniellides D and E is possibly associated with exerting cytotoxicity against cancer cells .
 Chemical: isovalerate; Chemical: feroniellides D and E
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: isovalerate; Chemical: feroniellides D and E