One source of a musky odor in perfumes is civetone, a compound extracted from the scent gland of the civet cat. Identify the functional group circled. 
Definitions:
Perception
The process by which sensory information is interpreted and organized to represent and understand the environment.
Visual-Form Agnosia
A condition where a person can see objects but cannot understand their shape, leading to an inability to recognize them.
Trichromatic Theory
A theory of color vision stating that the human eye has three types of receptors sensitive to red, green, and blue wavelengths, forming the basis of our color perception.
Opponent-Process Pairing
A theory in visual and emotional perception stating that elements are controlled by the interaction of opposing processes, leading to experiences of complementary contrasts.
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