19129
Over the last few decades , dipeptides as well as their analogues have served as important model systems for the computational studies concerning the structure of protein and energetics of protein folding .
 Chemical: dipeptides
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: dipeptides