3-Fluorophenmetrazine (3-FPM) is a synthetic molecule of the amphetamine family. Molecules of the amphetamine class contain a phenethylamine core featuring a phenyl ring bound to an amino (NH2) group through an ethyl chain with an additional methyl substitution at Rα. Amphetamines are alpha-methylated phenethylamines. 3-FPM contains a fluorine atom attached at R3 of the phenyl ring. Additionally, part of its amphetamine skeleton is incorporated into a morpholine ring. At R2 of its chain, an oxygen group is bound — this oxygen group is linked by an ethyl chain to the terminal amine of the amphetamine chain to form a morpholine group. 3-FPM is a fluorinated derivative of phenmetrazine.