Pyrrolidinophenones

α-Pyrrolidinovalerophenone (α-PVP), also known as α-pyrrolidinopentiophenone , O-2387, β-keto-prolintane, prolintanone, or desmethylpyrovalerone, or colloquially as flakka or gravel, is a synthetic stimulant of the cathinone class developed in the 1960s that has been sold as a designer drug and often consumed for recreational reasons. α-PVP is chemically related to pyrovalerone and is the ketone analog of prolintane.

Pyrovalerone (Centroton, 4-Methyl-β-keto-prolintane, Thymergix, O-2371) is a central nervous system (CNS) stimulant that acts as a norepinephrine–dopamine reuptake inhibitor (NDRI). It was developed in the 1980s and had briefly been approved in Spain and France for chronic fatigue or lethargy and as an appetite suppressant, but was withdrawn from both markets around 2001 due to safety concerns including problems with abuse and dependence. It is closely related on a structural level to a number of other cathinone stimulants, such as α-PVP, MDPV and prolintane.

Methylenedioxypyrovalerone (MDPV) is a stimulant of the cathinone class that acts as a norepinephrine–dopamine reuptake inhibitor (NDRI).

Naphyrone, also known as O-2482 and naphthylpyrovalerone, is a stimulant drug of the cathinone and naphthylaminopropane families. It was derived from pyrovalerone and acts as a serotonin–norepinephrine–dopamine reuptake inhibitor (SNDRI). Naphyrone has been reported as a novel designer drug. No safety or toxicity data is available on the drug.

α-Pyrrolidinopropiophenone (α-PPP), is a stimulant drug. It is similar in structure to the appetite suppressant diethylpropion and has analogous effects in animals. Little is known about this compound, but it has been detected by laboratories in Germany as an ingredient in "ecstasy" tablets seized by law enforcement authorities. This drug has been found to produce stimulant effects in animals and produces highly stimulating effects in humans, based on the experiences of the individuals who have tried it. Most of the individuals who have tried it prefer α-PVP to it, but prefer this drug over α-

'''3',4'-Methylenedioxy-α-pyrrolidinobutyrophenone (MDPBP''') is a stimulant of the cathinone class developed in the 1960s, which has been reported as a novel designer drug. MDPBP is sometimes sold under the name "NRG-1" as a mixture with other cathinone derivatives, including flephedrone, pentylone, MαPPP and its higher homologue MDPV. As with other cathinones, MDPBP has been shown to have reinforcing effects in rats.

MDPHP ('''3',4'-Methylenedioxy-α-pyrrolidinohexiophenone) is a stimulant of the cathinone class originally developed in the 1960s, which has been reported as a novel designer drug. In the UK its slang name is monkey dust'''. It is closely related to the potent stimulant MDPV though with slightly milder effects, and has been used as an alternative in some countries following the banning of MDPV.

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.

'''3',4'-Methylenedioxy-α-pyrrolidinopropiophenone (MDPPP''') is a stimulant designer drug. It was sold in Germany in the late 1990s and early 2000s as an ingredient in imitation ecstasy (MDMA) pills. It shares a similar chemical structure with α-PPP and MDPV, and has been shown to have reinforcing effects in rats.

α-Pyrrolidinoheptaphenone (PV8, α-PEP, α-PHPP, Aphpp, A-PHPP) is a designer drug of the pyrrolidinophenone class of cathinones. It is the higher homolog of α-pyrrolidinohexiophenone (α-PHP).

'''4'-Methyl-α-pyrrolidinobutiophenone or MPBP''' is a stimulant compound which has been reported as a novel designer drug. It is closely related to pyrovalerone, being simply its chain-shortened homologue.