What is the correct structure for (S) -4-cyclohexyl-3-methyl-2-butanone? 
Definitions:
Ependymal Cells
Glial cells that line the ventricles in the brain and the central canal of the spinal cord, involved in the production of cerebrospinal fluid.
Reaction Time
The duration it takes for an individual to respond to a stimulus.
Central Nervous System
The complex of nerve tissues that controls the activities of the body, comprising the brain and spinal cord.
Spinal Cord
A long, thin bundle of nervous tissue that extends from the brain down the vertebral column, transmitting nerve impulses to and from the brain.
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