Phenylethylpyrrolidine

1-(2-Phenylethyl)pyrrolidine (PEP) is a chemical compound. It is an analogue of 2-phenylethylamine where the amine has been replaced by a pyrrolidine ring.

It is the base chemical structure for a series of stimulant drugs, including:

All of these compounds differ from PEP in that the alpha carbon is extended and a ketone is attached to the beta carbon (with the exception of prolintane), among other modifications.

It is unknown whether PEP itself has any stimulant properties, but it can be considered likely.