2C-O-4 IUPAC name: 2-(4-Isopropoxy-2,5-dimethoxyphenyl)ethanamine CAS number 15394-83-9 Molecular formula C13H21NO3. 2C-O-4 or 4-isopropoxy-2,5-dimethoxyphenethylamine is a phenethylamine of the 2C family. It is also a positional isomer of isoproscaline and was probably first synthesized by Alexander Shulgin. It produces hallucinogenic, psychedelic, and entheogenic effects. Because of the low potency of 2C-O-4, and the inactivity of 2C-O, Shulgin felt that the 2C-O series would not be an exciting area for research, and did not pursue any further analogues.
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