Which of the following substrates cannot be used as an immediate precursor to synthesize an ester? 
Definitions:
Glucose Absorbed
The process by which glucose, a simple sugar, is taken up from the intestinal tract into the bloodstream, providing energy for cellular activities.
Vitamins A, E, D, K
Fat-soluble vitamins essential for various bodily functions such as vision, antioxidant protection, bone health, and blood clotting.
Lipids
A group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others.
Vasoconstriction
The narrowing of blood vessels, which increases blood pressure and reduces blood flow to certain areas of the body.
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