2-phenyl-3-aminobutane 2-phenyl-3-aminobutane 2-phenyl-3-aminobutane (also known as β-methylamphetamine) is a stimulant of the phenethylamine class that is closely related to its α-methyl analog pentorex. it was first synthesized by the german scientists felix haffner and fritz sommer in 1939 as a stimulant with milder effects, shorter duration, lower toxicity and fewer side effects compared to previously known drugs such as amphetamine. 2-phenyl-3-aminobutaneclinical dataother namesβ-methylamphetamineidentifiers iupac name 3-phenylbutan-2-amine cas number21906-17-2pubchem cid210912chemspider182828comptox dashboard (epa)dtxsid50944501 chemical and physical dataformulac10h15nmolar mass149.237 g·mol−13d model (jsmol)interactive image smiles c1(=cc=cc=c1)c(c)c(c)n inchi inchi=1/c10h15n/c1-8(9(2)11)10-6-4-3-5-7-10/h3-9h,11h2,1-2h3key:bkrhevjttwayfj-uhfffaoysa-n 2-phenyl-3-aminobutane is banned in some countries as a structural isomer of methamphetamine.