Saquinavir (trade name Invirase) belongs to a class of drugs called protease inhibitors, w...

Saquinavir (trade name Invirase) belongs to a class of drugs called protease inhibitors, which are used to treat HIV (human immunodeficiency virus).

a.              Locate all stereogenic centers in saquinavir, and label each stereogenic center as R or S.

b.              Draw the enantiomer of saquinavir.

c.              Draw a diastereomer of saquinavir.

d.              Draw a constitutional isomer that contains at least one different functional group.