Introduction | Discovery | Chemical Composition
Usage | Historical Significance
Formal Chemical Name (IUPAC):
7,8-didehydro-4,5-epoxy-17-methylmorphinan-
3,6-diol diacetate
Heroin is the 3,6-diacetyl derivative of morphine (hence diacetylmorphine) and is synthesised from it by acetylation.
A molecule of heroin is made up of 21 atoms of carbon, 23 atoms of hydrogen, 1 atom of nitrogen, and 5 atoms of oxygen. There are six double bonds within each molecule, and the rest of the bonds are single. 
Precent composition by mass: 68.28% Carbon, 6.28% Hydrogen, 3.79% Nitrogen, 21.65% Oxygen.
Properties:
Heroin is a white and sometimes brownish, odorless compound and is a highly addicive narcotic when abused.