Symbescaline (SB), also known as 3,5-diethoxy-4-methoxyphenethylamine, is a psychoactive drug of the phenethylamine and scaline families related to mescaline. It is the analogue of mescaline in which the methoxy groups at the 3 and 5 positions have been replaced with ethoxy groups. In addition, symbescaline is a positional isomer of asymbescaline.