What is the leaving group in the following reaction? 
Definitions:
Diabetes Insipidus
A condition characterized by excessive thirst and excretion of large amounts of severely diluted urine, unrelated to diabetes mellitus.
Thyroid Hormone
Hormones produced by the thyroid gland, important for regulating metabolism, energy generation, and growth and development.
Aldosterone
A hormone produced by the adrenal glands that helps regulate blood pressure by managing the balance of sodium and potassium in the body.
Cortisol
A steroid hormone produced by the adrenal glands that plays a vital role in the body's response to stress as well as metabolism and immune function.
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