Examine the structure of cyclosporin A (page 503).
a. By drawing a dashed line at each peptide bond, deduce how many amino acid units are present in cyclosporin A.
b. Three of the units are identical. What are they?
c. Two of the units are unusual and are not listed in Table 17.1. What are their structures?
d. There are only three other types of amino acids present, though there may be more than one unit of each. What are they, and how many units are there of each?