Heroin /hɛroʊɪn/ (diacetylmorphine or morphine diacetate also known as diamorphine (BAN INN)) and commonly known by its street names of H smack horse brown black tar and others is an opioid analgesic originally synthesized by C.R. Alder Wright in 1874 by adding two acetyl groups to the molecule morphine which is found naturally in the opium poppy. It is the 36-diacetyl ester of morphine.
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