Aspartame, an artificial sweetener used in Equal
® and diet beverages, has the following structure. Identify the indicated functional groups in Aspartame.

◦ I = anhydride; II = ketone; III = amine
◦ I = ester; II = amide; III = amine
◦ I = ester; II = amine; III = amide
◦ I = ether; II = amine; III = amide
◦ I = ether; II = amide; III = amine