Heroin is an opioid drug most commonly used as a recreational medication for its euphoric effects. Medically it is used in several countries to relieve pain or in opioid replacement therapy.

Molecular Formula: C21H23NO5
Average mass: 369.411 Da
Molecular weight: 369.4 g/mol
Monoisotopic mass: 369.157623 Da
ChemSpider ID: 4575379