4-MPHP, 4′-methyl-α-Pyrrolidinohexanophenone is being sold online at researchchemvendor.com and has a full IUPAC name of 2-(pyrrolidin-1-yl)-1-(p-tolyl)hexan-1-one, monohydrochloride which belongs to a class of research chemicals called central nervous system stimulants.