Identification and Quantitation of 11-Nor- 9-Tetrahydrocannabivarin-9-Carboxylic Acid, a Major Metabolite of 9-Tetrahydrocannabivarin

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Abstract
After incubation of Δ9-tetrahydrocannabivarin with human hepatocytes, a major metabolic product was detected by gas chromatography—mass spectrometry that showed identical retention time and mass spectrum to the synthetic 11-nor-Δ9-tetrahydrocannabivarin-9-carboxylic acid (11-nor-Δ9-THCV-9-COOH). Analysis of human urine specimens from marijuana users and plasma samples from Marinol® users showed that 11-nor-Δ9-THCV-9-COOH was only present in urine specimens of marijuana users. These results supported the conclusion that identification of 11-nor-Δ9-THCV-9-COOH in a donor's urine specimen indicates the use or ingestion of cannabis-related product(s) and would not explain the sole use of Marinol.