Butylone, also known as β-keto-N-methylbenzodioxolylbutanamine (bk-MBDB), is an entactogen, psychedelic, and stimulant of the phenethylaminechemical class. It is the β-keto analogue of MBDB.
Butylone was first synthesized by Koeppe, Ludwig and Zeile which is mentioned in their 1967 paper. It remained an obscure product of academia until 2005 when it was synthesized by a chemical supply company, and has since continued to be sold as a research chemical. It has since been explored as a possible entheogen. Butylone shares the same relationship to MBDB as methylone does to MDMA (“Ecstasy”). The dosage range is not fully understood but seems to be lower than for MBDB. Formal research on this chemical was first conducted in 2009, when it was shown to be metabolised in a similar manner to related drugs like methylone.