2,4,5-Trimethoxyphenethylamine

2C-O, also known as 2,4,5-trimethoxyphenethylamine (2,4,5-TMPEA) or TMPEA-2, is a serotonin receptor modulator of the phenethylamine and 2C families related to the psychedelic drug mescaline. It is a positional isomer of mescaline (3,4,5-trimethoxyphenethylamine) and is the α-desmethyl analogue of 2,4,5-trimethoxyamphetamine (TMA-2).