Tetrahydrocannabinol

Tetrahydrocannabinol ( /ˌtɛtrəˌhaɪdrɵkəˈnæbɨnɒl/ tet-rə-HY-drə-kə-NAB-i-nol; THC), also known as delta-9-tetrahydrocannabinol (Δ9-THC), is the principal psychoactive constituent of the cannabis plant. First isolated in 1964, in its pure form, it is a glassy solid when cold, and becomes viscous and sticky if warmed. Synthetically prepared THC, officially referred to by its INN, dronabinol, is available by prescription in the U.S. and Canada under the brand name Marinol. An aromatic terpenoid, THC has a very low solubility in water, but good solubility in most organic solvents, specifically lipids and alcohols.