Diacetylmorphin

Heroin (diacetylmorphine or morphine diacetate (INN)), also known as diamorphine (BAN), is an opioid analgesic synthesized by C.R Alder Wright in 1874 by adding two acetyl groups to the molecule morphine, a derivative of the opium poppy. When used in medicine it is typically used to treat severe pain, such as that resulting from a heart attack. It is the 3, 6-diacetyl ester of morphine, and functions as a morphine prodrug (meaning that it is metabolically converted to morphine inside the body. The white crystalline form considered "pure heroin" is usually the hydrochloride salt, diacetylmorphine hydrochloride. When heroin is supplied illegally, though, it is often adulterated to a freebase form, dulling the sheen and consistency to a matte-white powder.