are a broad range of compounds that share a common phenylethan-2-amine structure. Some are naturally occurring neurotransmitters (Dopamine, Epinephrine) while some are psychoactive stimulants (Amphetamine), entactogens (MDMA), or hallucinogens (2C-E). Several psychedelic phenethylamines have been studied by Alexander Shulgin in his book PiHKAL, published in 1991. Many molecules can be classified as phenethylamines despite not being psychoactive. This article is centered on psychoactive phenethylamines.