What is the meaning of Methylenedioxyamphetamine?

An organic chemical with the empirical chemical formula C11H15NO2

  1. 3,4-methylenedioxyamphetamine, a psychedelic and entactogenic drug of the phenethylamine and amphetamine chemical classes.

3,4-methylenedioxyamphetamine, a psychedelic and entactogenic drug of the phenethylamine and amphetamine chemical classes.

Source: wiktionary.org