What’s the most consumed psychoactive drug in the world? That is C8H10N4O2 , or caffeine. Caffeine is a psychoactive drug that is legal and unregulated in most parts of the world. Found mostly in beverages, it also occurs naturally in some plants such as yerba mate. Caffeine is a stimulant of the central nervous system. Consequently, people drink it to reduce tiredness. It is a powdered crystalline, white substance that tastes bitter. The scientific name is trimethylxanthine and it’s found in seeds that are located in Asia, Africa, and South America. Caffeine has no odor, a density of 1.23 g/cm3 and a boiling point of 352 ℉ (177.8 ℃). There are 24 atoms and 4 elements in caffeine, therefore containing 8 carbon, 10 hydrogen, 4 nitrogen and 2 oxygen atoms, which is written as C8H10N4O2. In summary, caffeine is an important chemical compound that countless people use daily.