(S)-Tolterodin;Tolterodine S-Isomer Impurity;2-[(1S)-3-[Bis(1-methylethyl)amino]-1-phenylpropyl]-4-methyl-phenol;S-(-)-Tolterodine;Tolterodine IMpurity;Phenol, 2-[(1S)-3-[bis(1-methylethyl)amino]-1-phenylpropyl]-4-methyl-;(s)-2-(3-(Diisopropylamino)-1-phenylpropyl)-4-methylphenol;Tolterodine Tartrate EP Impurity F