19130
Here , we present a density functional structural study on a set of seven dipeptides having N - terminal selenocysteine residues ( the component in the C - terminus is varied with seven different combinations viz . Ala , Phe , Glu , Thr , Asn , Arg and Sec ) in gas and simulated aqueous phase using a polarizable continuum model ( PCM ) .
 Chemical: dipeptides; Chemical: N; Chemical: selenocysteine; Chemical: C; Chemical: Ala; Chemical: Phe; Chemical: Glu; Chemical: Thr; Chemical: Asn; Chemical: Arg; Chemical: Sec
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; Chemical: N; Chemical: selenocysteine; Chemical: C; Chemical: Ala; Chemical: Phe; Chemical: Glu; Chemical: Thr; Chemical: Asn; Chemical: Arg; Chemical: Sec