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From the four different extracts here tested , two of them , hexane and ethanol , presented a clear selectivity against both tumor cells lines investigated .
 Chemical: hexane; Chemical: ethanol
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: hexane; Chemical: ethanol