Alpha-Pyrrolidinobutiophenone

α-Pyrrolidinobutiophenone (α-PBP) is a stimulant compound developed in the 1960s which has been reported as a novel designer drug. It can be thought of as the homologue lying between the two better known drugs α-PPP and α-PVP.

Legality
In the United States, it is a Schedule I controlled substance.

Sweden's public health agency suggested to classify α-PBP as hazardous substance on November 10, 2014.

As of October 2015 α-PBP is a controlled substance in China.