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In conclusion , HT ethers , especially the hexyl derivative , are a potential alternative to hydroxytyrosol , and their effect merits additional research to determine their role in the prophylaxis of vascular disease .
 Chemical: ethers; Chemical: hexyl; Chemical: hydroxytyrosol
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: ethers; Chemical: hexyl; Chemical: hydroxytyrosol