Propose a step-by-step mechanism for the general-acid catalyzed reaction shown below. 
Definitions:
ADH
Antidiuretic hormone, a peptide hormone that helps regulate and balance the amount of water in the body by controlling water reabsorption in the kidneys.
Water Reabsorption
The process by which water is absorbed from the filtrate in the kidneys back into the blood.
Plasma Osmolality
A measure of the concentration of solutes in blood plasma, important for maintaining proper fluid balance and osmotic pressure in the body.
ADH Production
The process by which the posterior pituitary gland secretes antidiuretic hormone (ADH), which helps control the balance of water in the body by affecting the kidneys.
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