. . . . . "Heroin According to Wikipedia Heroin (diacetylmorphine or morphine diacetate, also known as diamorphine, and colloquially as H, smack, horse, brown, black, tar and other names is an opioid analgesic synthesised by C.R. Alder Wright in 1874 by adding two acetyl groups to the molecule morphine, found in the opium poppy." . .