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THC or Tetrahydrocannabinol

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Tetrahydrocannabinol or THC is the primary psychoactive agent found in the Cannabis plant.

Tetrahydrocannabinol or THC is the primary psychoactive agent found in the Cannabis (marijuana) plant.

Anthonyvidal, Wikipedia Commons
The molecular formula for tetrahydrocannabinol is C21H30O2.

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