Which of the following is a representation of the enantiomer of the following substance? 
Definitions:
Aortic Valve
A valve in the heart between the left ventricle and the aorta that prevents blood from flowing back into the ventricle after it has been pumped out.
Coronary Sinus
A large vein on the posterior side of the heart that collects blood from the heart muscle (myocardium) and returns it to the right atrium.
Coronary Sulcus
A groove on the surface of the heart that marks the division between the atria and the ventricles.
Oxygen-poor Blood
Blood that has circulated through the body and has a lower oxygen content, returning to the heart for reoxygenation.
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