4-D, also known as 4-trideuteromethoxy-3,5-methoxyphenethylamine or as 4-trideuteromescaline, is a psychedelic drug of the scaline family related to mescaline. It is the isotopologue of mescaline in which the three hydrogen atoms of the methoxy group at the 4 position have been replaced with the deuterium isotopes.
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