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:
Astrocytes
Star-shaped glial cells in the brain and spinal cord, crucial for the repair and scarring process of the central nervous system.
Olfactory Bulbs
Structure located in the forebrain of vertebrates that processes information about odors detected by cells in the nasal cavity.
Hippocampus
The hippocampus is a major component of the human brain, involved in memory formation and spatial navigation.
Neurons
Cells in the nervous system that transmit information through electrical and chemical signals.
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