11291
A new 2 , 5 - diketopiperazine , ( R ) - 2 - ( 2 - ( furan - 2 - yl ) - oxoethyl ) - octahydropyrrolo [ 1 , 2 - a ] pyrazine - 1 , 4 - dione , and seven known compounds were isolated from the ethyl acetate extract of liquid fermentation broth of Armillaria mellea .
 Chemical: 2 , 5 - diketopiperazine; Chemical: ( R ) - 2 - ( 2 - ( furan - 2 - yl ) - oxoethyl ) - octahydropyrrolo [ 1 , 2 - a ] pyrazine - 1 , 4 - dione; Chemical: ethyl acetate
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: 2 , 5 - diketopiperazine; Chemical: ( R ) - 2 - ( 2 - ( furan - 2 - yl ) - oxoethyl ) - octahydropyrrolo [ 1 , 2 - a ] pyrazine - 1 , 4 - dione; Chemical: ethyl acetate