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Because HT inhibits platelet aggregation , the aim of the study was to assess the possible anti - platelet effect of five HT ether derivatives ( ethyl , butyl , hexyl , octyl and dodecyl ) after oral administration to rats .
 Chemical: ether; Chemical: ethyl; Chemical: butyl; Chemical: hexyl; Chemical: octyl; Chemical: dodecyl
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: ether; Chemical: ethyl; Chemical: butyl; Chemical: hexyl; Chemical: octyl; Chemical: dodecyl