What starting compound(s) would you use in an aldol reaction to prepare as the major product: 
Definitions:
Central Nervous System
The complex of nerve tissues that controls the activities of the body, comprising the brain and the spinal cord.
Parasympathetic
is part of the autonomic nervous system that conserves energy by slowing the heart rate and increasing intestinal and gland activity.
Neural Impulses
Electrical signals transmitted along neurons, facilitating communication within the nervous system.
Incoming Signal
An external or internal stimulus that is received and processed by a biological, mechanical, or electronic system.
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