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Systematic (IUPAC) name
3-methoxy-6-acetyl-(5α,6α)-7,8-didehydro-4,5-epoxy- 3-methoxy-17-methylmorphinan
Clinical data
Routes of

Intravenous (if present in heroin)

LD50 (mouse) = 112mg/kg
CAS Number 6703-27-1
ATC code none
PubChem CID 5745725
Synonyms 6-acetylcodeine
Chemical data
Formula C20H23NO4
Molar mass 341.4 g/mol[[Script error: No such module "String".]]
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6-Monoacetylcodeine (6-MAC) is a toxic acetate ester of codeine in which the hydroxyl group on the 6 position has been acetylated. It is occasionally present as an impurity in street heroin and is typically created when attempting to create heroin from a solution of morphine in which some of the codeine from the original opium solution still remains. It is formed either through the addition of acetic anhydride, which will only acetylate the 6 position on the codeine or as a result of the addition of acetic acid with a catalyst in an attempt to create 6-monoacetylmorphine, the equivalent ester of morphine which is slightly more potent than heroin itself. Administration of 6-MAC through any route results in the rapid release of histamine into the blood stream which can lead to potentially fatal anaphylactic shock. 6-monoacetylcodeine is eventually metabolised into codeine and then into morphine. Since only illegally produced heroin is likely to contain 6-MAC, testing for the presence of it in the urine can be used as a fairly reliable method of detecting the use of illicit heroin, as opposed to prescription painkillers.

See also