20695
Biological evaluation revealed that most tested compounds were potent dipeptidyl peptidase 4 ( DPP - 4 ) inhibitors , among them , the cyclopropyl - substituted phenylalanine derivative 11h displayed the most potent DPP - 4 inhibitory activity with an IC50 value of 0 . 247 mu M .
 Chemical: cyclopropyl - substituted phenylalanine
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: cyclopropyl - substituted phenylalanine