11881
Identification of N - acyl 4 - ( 5 - pyrimidine - 2 , 4 - dionyl ) phenylalanine derivatives and their orally active prodrug esters as dual - acting alpha4 - beta1 and alpha4 - beta7 receptor antagonists .
 Chemical: N - acyl 4 - ( 5 - pyrimidine - 2 , 4 - dionyl ) phenylalanine; Chemical: esters
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: N - acyl 4 - ( 5 - pyrimidine - 2 , 4 - dionyl ) phenylalanine; Chemical: esters