Aspartame, an artificial sweetener used in Equal® and diet beverages, has the following structure. Identify the functional groups in Aspartame. 
Definitions:
Rods
Photoreceptor cells in the retina of the eye that are responsible for vision at low light levels.
Cones
Photoreceptor cells in the retina of the eye that are responsible for color vision and function best in relatively bright light.
Human Retina
The light-sensitive layer of tissue at the back of the inner eye, which contains photoreceptor cells that convert light into neural signals.
Total Color Blindness
A rare condition where an individual cannot perceive any color at all, seeing only shades of gray.
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