Which of the following structures contains a secondary amine? 
Definitions:
Compound Eye
An eye, such as that of an insect, consisting of many light-sensitive units called ommatidia.
Vertebrate Eye
The complex visual organ in vertebrates that allows vision and is typically adapted to the environmental light conditions of the organism.
Light Intensity
The measure of the wavelength-weighted power emitted by a light source, indicating the visual brightness perceived by the human eye.
Cyclic AMP
A second messenger important in many biological processes, including the regulation of glycogen, sugar, and lipid metabolism.
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