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Physical constants and instrumental data (melting point [mp], thin-layer chromatography [TLC] [Rf], gas chromatography [GC] [Rt], [α]D25, 1H- and 13C-nuclear magnetic resonance [NMR], infrared (IR), 70-eV, electron impact-mass spectroscopy [EI-MS], color, and microcrystalline tests) are reported for the individual stereoisomers, racemates, and corresponding hydrochloride salts of 4-methylaminorex (2-amino-4-methyl-5-phenyl-Δ2-oxazoline, 4,5-dihydro-4-methyl-5-phenyl-2-oxazolamine, McN-822, “U4Euh,” “ICE”). The data allow identification and differentiation of illicit samples of 4-methylaminorex.