11547
Among these derivatives were N - ( 3 - oxobutyl ) - Tyr and two acetylated compounds , N - acetyl - Tyr and O - acetyl - Tyr , which were synthesized by reaction of Tyr with methyl vinyl ketone and acetic anhydride , respectively , at 37 degrees C .
 Chemical: N - ( 3 - oxobutyl ) - Tyr; Chemical: N - acetyl - Tyr; Chemical: O - acetyl - Tyr; Chemical: Tyr; Chemical: methyl vinyl ketone; Chemical: acetic anhydride
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: N - ( 3 - oxobutyl ) - Tyr; Chemical: N - acetyl - Tyr; Chemical: O - acetyl - Tyr; Chemical: Tyr; Chemical: methyl vinyl ketone; Chemical: acetic anhydride