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M. Repetto, M. Lopez-Artiguez, D. Martinez. 
“Separation of cannabinoids”. 
Bulletin on Narcotics. 1976 Oct-Dec;28(4):69-74.
The three main cannabinoids-cannabidiol CBD, tetrahydrocannabinol THC and cannabinol CBN-can be isolated from purified extracts of cannabis by preparative gas chromatography in satisfactory amounts and with a degree of purity similar to that of the sample substances provided by the United Nations Narcotics Laboratory.
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