16250
Among all the aroma compounds , 9 key ones were identified in all samples , including ethyl 2 - methylbutanoate , butyl acetate , 1 - butanol , ethyl hexanoate , 1 - hexanol , butanoic acid , beta - damascenone , hexanoic acid , and octanoic acid .
 Chemical: ethyl 2 - methylbutanoate; Chemical: butyl acetate; Chemical: 1 - butanol; Chemical: ethyl hexanoate; Chemical: 1 - hexanol; Chemical: butanoic acid; Chemical: beta - damascenone; Chemical: hexanoic acid; Chemical: octanoic acid
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 2 - methylbutanoate; Chemical: butyl acetate; Chemical: 1 - butanol; Chemical: ethyl hexanoate; Chemical: 1 - hexanol; Chemical: butanoic acid; Chemical: beta - damascenone; Chemical: hexanoic acid; Chemical: octanoic acid