https://nij.ojp.gov/library/publications/methyl-esters-ecgonine-injection-port-produced-artifacts-cocaine-base-crack
Methyl Esters of Ecgonine: Injection-Port Produced Artifacts From Cocaine Base (Crack) Exhibits |...
This paper discusses the formation of ecgonine methyl ester and pseudoecgonine methyl ester as artifacts in gas chromatography/mass spectrometry (GC/MS)...