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From Citizendium, the Citizens' Compendium
In pharmacology, tetrahydrocannabinol (THC) is a cannabinoid and is "a psychoactive compound extracted from the resin of Cannabis sativa (marihuana, hashish). The isomer delta-9-tetrahydrocannabinol (THC) is considered the most active form, producing characteristic mood and perceptual changes associated with this compound. Dronabinol is a synthetic form of delta-9-THC."