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A DOx-family phenethylamine psychedelic (2,5-dimethoxy-3,4-dimethylamphetamine), first synthesized by chemist Alexander Shulgin. Despite sometimes being searched alongside "acid," it is chemically unrelated to LSD, which is a lysergamide, not a phenethylamine.

Example: Shulgin documented his own dosed trials of it, along with dozens of related compounds, in his book PiHKAL — one of the primary historical records of this entire drug class.