
Usnic acid, also known as lichenic acid, is a compound derived from natural usnea with the chemical formula C18H16O7 and a molecular weight of 344.32. It usually exists in the form of light to golden needle-shaped crystals, which are tasteless, odorless, non-toxic, non-corrosive, and non-volatile. Usnic acid is easily soluble in chloroform and glacial acetic acid, but difficult to dissolve in hot alcohol. It is a light yellow silk needle-shaped crystal with specific optical rotation and ultraviolet absorption characteristics. This compound not only has a wide range of biological activities but also shows great application potential in many fields due to its unique physical and chemical properties. Due to its multiple medicinal activities, it is often used as a pharmaceutical raw material.
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