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The headspace analyses displayed a decrease only in ethyl octanoate volatility in presence of catechin , whereas no significant difference in other esters concentrations was observed .
 Chemical: ethyl octanoate; Chemical: catechin; Chemical: esters
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 octanoate; Chemical: catechin; Chemical: esters