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Of the tested extracts , the ethyl acetate fraction was the most potent ( half - maximal inhibitory concentration ( IC50 ) : 97 micro g / mL ) followed by aqueous fraction IC50 : 109 micro g / mL ) .
 Chemical: ethyl acetate
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: ethyl acetate