( N ‐propyl norbutylone 1 ), 1‐([3,4‐methylenedioxyphenyl])‐2‐(butylamino)butan‐1‐one ( N ‐butyl norbutylone 2) , 2‐(benzylamino)‐1‐phenylheptan‐1‐one ( N ‐benzyl norheptedrone 3 ), and 1‐(1‐[3,4‐dimethoxyphenyl]propan‐2‐yl)pyrrolidine ( N ‐pyrrolidinyl‐3...