N-[(R)-1-(2-Hydroxy-3,5-dimethyl­phenyl)ethyl]-N-[(R)-2-methyl-1-phenyl­propyl]ammonium chloride

2,4-Dimethyl-6-[(1R)-1-{[(1R)-2-methyl-1-phenyl­propyl]amino}­ethyl]phenol, (I), has been synthesized and its absolute configuration has been determined by reference to the crystal structure of the title compound, C20H28NO+·Cl−, (II), the hydro­chloride of (I). The new stereogenic centre (the C atom adjacent to the N atom on the phenol side) was unambiguously determined to have an R configuration.