Which of the following molecules would be required as a reacting to form the product in the reaction scheme shown below? 
Definitions:
Arterioles
Small blood vessels that extend from the arteries and lead to the capillaries, playing a crucial role in regulating blood flow and pressure.
Capillaries
The smallest blood vessels in the body, connecting veins and arteries and facilitating the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and tissues.
SA Node
The sinoatrial node, a group of cells in the right atrium of the heart that acts as a natural pacemaker, initiating the heart's electrical impulses.
AV Node
The AV Node, or Atrioventricular Node, is a part of the heart's electrical system that acts as a gatekeeper, controlling the electrical impulses between the atria and ventricles.
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