MFPVP
MFPVP (3-Methyl-4-fluoro-α-pyrrolidinovalerophenone) is a recreational designer drug from the substituted cathinone family, with stimulant effects. It was first identified in Sweden in April 2020 and was among the most widely encountered substituted cathinone derivatives in 2021, though it since appears to have declined in prevalence. It is illegal in Virginia. See also 
 3F-PVP
 4F-PVP
 4F-PHP
 4Cl-PVP
 4-Cl-3-MMC
 MOPVP
 DMPVP
 MDPV
 O-2390
 Pyrovalerone

References 

Pyrrolidinophenones
Designer drugs