section_path: Cannabis in the Single Convention/Tetrahydrocannabinol
section_name: Tetrahydrocannabinol
paragraph_text: Tetrahydrocannabinol
  
  delta -9-THC (tetrahydrocannabinol, or dronabinol) is not listed in the Schedules of the Single Convention but in the Schedules of a distinct treaty: the Convention on Psychotropic Substances of 1971. It has its own scheduling history: delta -9-THC was downgraded from Schedule I to Schedule II of the 1971 Convention in 1991, while other isomers of THC (such as delta -8-THC, delta -10-THC, etc.) remained in Schedule I.