(R)-2-(3-(diisopropylamino)-1-phenylpropyl)-4-methylphenol 2,3-dihydroxysuccinate;2-[(1R)-3-[bis(1-methylethyl)amino]-1-phenylpropyl]-4-methyl-, (2R,3R)-2,3-dihydroxybutanedioate (1:1); (R)-2-[3-[Bis(1-methylethyl)amino]-1-phenylpropyl]-4-methylphenol (2R,3R)-2,3- dihydroxybutanedioate (1:1) (salt); (+)-(R)-2-[ -[2-(Diisopropylamino)ethyl]benzyl]-p-cresol l-tartrate (1:1) (salt); (R)-2-[3-(Diisopropylamino)-1-phenylpropyl]-4-methylphenol tartrate