Which of the following compounds is an enol of compound X drawn below? 
Definitions:
Collection tube
A tube used in medical and clinical settings for the collection of blood or other specimens from patients for analysis.
Gray stopper
A type of closure used in medical vials or tubes, often indicating specific properties or tests associated with the sample container.
Blood collection tube
A sterile glass or plastic tube with a closure that is evacuated to create a vacuum enabling the draw of a predetermined volume of blood for testing.
Coagulation studies
A series of tests that evaluate the blood's ability to clot and identify disorders of blood clotting.
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