What is the starting material in the following reaction? 
Definitions:
Thalamus
A brain structure that acts as a relay center, processing and transmitting sensory and motor signals to the cerebral cortex.
Third Ventricle
A median cleft between the two halves of the brain that is filled with cerebrospinal fluid.
First Ventricle
Also known as the left ventricle, a chamber of the heart responsible for pumping oxygenated blood to the aorta and systemic circulation.
Limbic System
A complex system of nerves and networks in the brain, involved with instinct and mood, controlling basic emotions, and drives such as fear and pleasure.
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