Insulin is a multi-peptide hormone that is released in response to high blood glucose levels thereby regulating the metabolism of carbohydrates, fats, and proteins. Shown below a ribbon representation of the 3D structure as well as a pictorial representation of the primary sequence (PDB = 1trz). Answer the following questions about this peptide. Draw the chemical structure of the last eight amino acids in the B chain in the correct protonation state. \{Note: Make sure not to ignore stereochemistry. }