What is C-terminal tryptic peptide?
Its quite simple if you look at the basics! Lets have a look at the sequence you give:


  AGWRGSDSHSR


Write that in 3-letter terms1:


  Ala-Gly-Trp-Arg-Gly-Ser-Asp-Ser-His-Ser-Arg


Pay attention to the C-terminus. The last amino acid residue in the sequence is Arginine. Now, its well established that Trypsin cleaves a polypeptide after (i.e. towards the C-terminal side of) Lysine and Arginine2.

Thus, C-terminal tryptic peptide is the peptide that remains after a polypeptide has been treated with Trypsin.