GREG WILLIAMS / SCIENCE PHOTO LIBRARY GREG WILLIAMS / SCIENCE PHOTO LIBRARY
Mescaline is an alkaloid of peyote and several other species of cactus. Like many other phenethylamines, mescaline is psychoactive. Its hallucinogenic properties are similar to those of LSD. Peyote has been part of Native American religious ceremonies for thousands of years. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).
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