Tetrahydrocannabinol ( THC ) usually refers to the naturally existing isomer of delta-9-THC, but also may include delta-8-THC. Delta-9-tetrahydrocannabinol and delta-1-tetrahydrocannabinol are two names for the same molecule according to different numbering systems (monoterpenoid and dibenzopyran nomenclature). Generally the natural (-)-trans-isomer of delta-9-THC of the cannabis plant, the (-)-delta-9-trans-tetrahydrocannabinol or dronabinol is designated. Chemically, delta-9-THC is defined as (6aR-trans)-6a,7,8,10a-tetrahy-dro6,6,9-trimethyl-3-pentyl-6H-dibenzo[b,d]pyran-1-ol with a molecular weight of 314.47 Da.
The term "cannabinoid" has different meanings. In a more narrow sense, it designates the natural cannabinoids of the cannabis plant. In the broadest sense, it includes all chemicals that bind to the cannabinoid receptors and related compounds. The endogenous ligands of the cannabinoid receptors have been termed endocannabinoids.
Cannabidiol ( CBD ), is the major non-psychotropic cannabinoid found in Cannabis. It has shown anti-epileptic, anti-inflammatory, anti-emetic, muscle relaxing, anxiolytic, neuroprotective and anti-psychotic activity and reduces the psychoactive effects of THC. The mode of action of cannabidiol is not fully understood and several mechanisms have been proposed, including an antagonistic action at the CB1 receptor.
Cannabis sativa L. ( Hemp ) is an annual plant, normally dioecious, with male and female flowers developing on separate plants. Depending on THC and CBD content hemp can be divided into fibre and drug types. There are regional differences in the employment of the terms cannabis, hemp and marijuana. In the USA and Canada the term "hemp" is usually only applied to fibre hemp in contrast to the term "marijuana", while in many regions of Europe hemp ("Hanf") can be applied to drug types as well (in the sense of the old term "Indian hemp").
Marijuana (marihuana) is a colloquial name for dried leaves and flowers of cannabis plant varieties rich in THC (1-30% THC). The median content of THC in marijuana originating in the USA from 1980 - 1997 was 4.2%.
Drop Science Staff Writer