Tetrahydrocannabiol also known as THC, (delta-9-tetrahydrocannabinol), or dronabinol, is the main psychoactive substance found in the Cannabis plant. In pure form, it is a glassy solid when cold and becomes viscous and sticky if warmed. It is sold as Marinol (a registered trademark of Solvay Pharmaceuticals). Dronabinol is also marketed, sold, and distributed by PAR Pharmaceutical Companies. THC is metabolized mainly to 11-OH-THC (11-hydroxy-THC) by the human body. This metabolite is still psychoactive and is further oxidized to 11-Nor-9-carboxy-THC (THC-COOH). In humans and animals, more than 100 metabolites could be identified, but 11-OH-THC and THC-COOH are the dominating metabolites. The main metabolite in urine is THC-COOH. Street names for THC include: pot, ganga, weed, grass, and many others. Short-term effects include memory and learning problems, distorted perception, and difficulty thinking and solving problems.