English 4'-Methoxy-α-Pyrrolidinopentiophenone Cited by user Aethyta on 05 Aug 2015 4'-Methoxy-α-Pyrrolidinopentiophenone (also known as 4-MeO-α-PVP and MOPVP) is a stimulant drug of the cathinone class that has been sold online as a designer drug.