“…Substitutions to generate prodrugs for this group are usually done at the terminal N. Labile groups such as acetyl, p‐toluenesulfonyl (p‐tosyl), methoxycarbonyl (n‐Moc), fluorenylmethyloxycarbonyl (Fmoc) and tert‐butoxycarbonyl (t‐Boc) can be used to protect the amine and are easily removable in physiological conditions (Collins et al, 2017; Collins et al, 2018; Mayer et al, 2020; Xu et al, 2020) (Figure 2). The same approach has been found to be useful in masking amphetamine, methamphetamine and MDA (3,4‐methylenedioxyamphetamine), although not all of the possible permutations have been found in the illicit drug market (Johnson & Bogun, 2019; Mayer et al, 2020; Segawa et al, 2023). Two chemically protected precursors of MDMA (t‐Boc‐MDMA and N‐Moc‐MDMA) have been found in MDMA tablets as adulterants but not as stand‐alone compounds, indicating those compounds, while potential prodrugs, are used as precursors in chemical production of MDMA for the illicit market (Croft et al, 2022; O'Reilly et al, 2022) (Figure 3).…”