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The butyl homologues of delta1-tetrahydrocannabinol, delta1-tetrahydrocannabinolic acid, cannabinol and cannabidiol have been identified in several samples of cannabis. 8 samples contained delta1-tetrahydrocannabinolic acid, one sample contained cannabinol and one sample contained both cannabinol and cannabidiol. Separation by gas chromatography and identification by gas chromotography-mass spectrometry was achieved by the preparation of trimethylsilyl, d9-trimethylsilyl, triethylsilyl and tri-n-propylsilyl derivatives.
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David J. Harvey (1976) studied this question.
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