Tetrahydrocannabivarin (THCV, THV) is a homologue of tetrahydrocannabinol (THC) having a propyl (3-carbon) side chain instead of a pentyl (5-carbon) group on the molecule, which makes it produce very different effects from THC. This terpeno-phenolic compound is found naturally in Cannabis, sometimes in significant amounts. The psychoactive effects of THCV in Cannabis preparations are not well characterized.