12734
From this study , we discern that the stacking energy of an aromatic ligand substituent can be improved by : 1 ) orienting the fragment dipole vector such that it is aligned in an antiparallel fashion with the dipole of the interacting protein amide group , 2 ) increasing its dipole moment , and 3 ) decreasing its pi - electron density .
 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: amide