Which of the following is an intermediate in the mechanism for amide synthesis through acylation of an amine? 
Definitions:
Microdrip
A type of drip set for an intravenous infusion that delivers a small amount of fluid, typically 60 drops per ml, used for precise fluid delivery.
Y Tubing
A type of medical tubing that splits a single input stream into two outputs, resembling the letter "Y."
Gravity Infusion
A method of delivering fluids into the body using the force of gravity, typically through intravenous therapy.
Blood Administration
The process of transfusing blood or blood products into an individual's circulatory system.
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