Tetrahydrofuran is a heterocyclic organic compound with the molecular formula C4H8O. Tetrahydrofuran belongs to ethers and is the complete hydrogenation product of furan. It is a colorless, water-miscible organic liquid with small viscosity at normal temperature and pressure. Because of its long liquid range, it is a commonly used medium polar aprotic solvent. Its main use is as a precursor of high molecular polymers.
Naturally occurring steroids are estrogen, cortisol, progesterone, and testosterone. Pharmacologically, they are used in several ways: alter steroid metabolism via statins to help lower cholesterol; as corticosteroids to help control inflammation, asthma, and lupus; and other forms to help hormone deficiency, such as delayed puberty, as well as diseases that result in loss of lean muscle mass, such as cancer and AIDS.
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