13012
The presence or absence of three types of intramolecular H - bonds , namely O . . . H - N , N . . . H - N and O . . . H - C that leave noticeable signatures in the IR spectra , play crucial roles in influencing the geometry of the peptide planes and in determining the energetics of the dipeptides .
 Chemical: H; Chemical: O; Chemical: H - N; Chemical: N; Chemical: H - N; Chemical: O; Chemical: H - C; 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: H; Chemical: O; Chemical: H - N; Chemical: N; Chemical: H - N; Chemical: O; Chemical: H - C; Chemical: dipeptides