21694
Backbone NH amide groups surrounded by aromatic rings have also been evidenced and are found to contribute significantly to the stabilization of aromatic pairs .
 Chemical: NH; Chemical: amide
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: NH; Chemical: amide