28968
The series of analogues was used to examine the impact of the E - ring chloride in binding D - Ala - D - Ala and on antimicrobial activity .
 Chemical: D - Ala - D - Ala
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: D - Ala - D - Ala