Legal status
Legal status
CAS Number 34138-58-4
PubChem (CID) 6423085
ChemSpider 4928584
UNII Y8D4922F5K YesY
Chemical and physical data
Formula C17H25NO
Molar mass 259.385 g/mol
3D model (Jmol) Interactive image
Chirality Racemic mixture

4'-Methyl-α-pyrrolidinohexiophenone or MPHP is a stimulant compound which has been reported as a novel designer drug.[1][2][3] It is closely related to pyrovalerone, being simply its chain-lengthened homologue. In the pyrrolidinophenone series, stimulant activity is maintained so long as the positions of the aryl, ketone and pyrrolidinyl groups are held constant, while the alkyl backbone can be varied anywhere between three and as many as seven carbons,[4] with highest potency usually seen with the pentyl or isohexyl backbone, and a variety of substituents are tolerated on the aromatic ring.[5]

In 2010 a group of researchers from the Institute of Forensic Medicine, University Hospital Jena, Germany concluded that MPHP can lead to serious poisoning with toxic liver damage and rhabdomyolysis.[6]


Sweden's public health agency suggested to classify MPHP as narcotic on June 1, 2015.[7]

See also


  1. Springer, D; Peters, FT; Fritschi, G; Maurer, HH (2003). "New designer drug 4'-methyl-alpha-pyrrolidinohexanophenone: studies on its metabolism and toxicological detection in urine using gas chromatography-mass spectrometry". Journal of Chromatography B. 789 (1): 79–91. doi:10.1016/S1570-0232(03)00043-6. PMID 12726846.
  2. Peters, FT; Dragan, CA; Kauffels, A; Schwaninger, AE; Zapp, J; Bureik, M; Maurer, HH (2009). "Biotechnological synthesis of the designer drug metabolite 4'-hydroxymethyl-alpha-pyrrolidinohexanophenone in fission yeast heterologously expressing human cytochrome P450 2D6--a versatile alternative to multistep chemical synthesis". Journal of analytical toxicology. 33 (4): 190–7. doi:10.1093/jat/33.4.190. PMID 19470220.
  3. "Acute poisoning involving the pyrrolidinophenone-type designer drug 4'-methyl-alpha-pyrrolidinohexanophenone (MPHP)". Forensic Sci. Int. 208 (1-3): e20–5. May 2011. doi:10.1016/j.forsciint.2011.02.026. PMID 21444164.
  4. GB patent 1149366, "α-substituted-ketones and processes for their preparation."
  5. Meltzer, PC; Butler, D; Deschamps, JR; Madras, BK (2006). "1-(4-Methylphenyl)-2-pyrrolidin-1-yl-pentan-1-one (Pyrovalerone) analogs. A promising class of monoamine uptake inhibitors". Journal of Medicinal Chemistry. 49 (4): 1420–32. doi:10.1021/jm050797a. PMC 2602954Freely accessible. PMID 16480278.
  6. Sauer, C.; Hoffmann, K.; Schimmel, U.; Peters, F. T. (2011). "Acute poisoning involving the pyrrolidinophenone-type designer drug 4′-methyl-alpha-pyrrolidinohexanophenone (MPHP)". Forensic Science International. 208 (1–3): e20–e25. doi:10.1016/j.forsciint.2011.02.026. PMID 21444164.
  7. "23 nya ämnen kan klassas som narkotika eller hälsofarlig vara". Retrieved 29 June 2015.

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