Tetramethoxyphenethylamine
Tetramethoxyphenethylamines (TeMPEA) are a group of positional isomers of the psychedelic cactus alkaloid mescaline. Some of them are described in the book PiHKAL by Alexander Shulgin and Ann Shulgin.
Source: Wikipedia — Tetramethoxyphenethylamine (CC BY-SA 4.0)