Metyrapone, with the CAS number 54-36-4, has the molecular formula C14H14N2O and a molecular weight of 226.27. Uses: Metyrapone is an adrenal cortex function inhibitor and a 11-β-hydroxylase inhibitor. It inhibits the production of cortisol and is used to treat adrenal cortex tumors, Cushing's syndrome, and other related conditions. It is also used in diagnostic tests for hypothalamic-pituitary function.