Tolterodine Dimer Impurity (Mixture of Diastereomers)

Chemical Name: Phenol, 2,​2'-​[[(1-​methylethyl)​imino]​bis(1-​phenyl-​3,​1-​propanediyl)​]​bis[4-​methyl-; 2,2'-[[(1-Methylethyl)imino]bis(1-phenyl-3,1-propanediyl)]bis[4-methylphenol]; 2,2’-[[(1-Methylethyl)imino]bis(1-phenyl-3,1-propanediyl)]bis[4-methylphenol] 2,2,2-trifluoroacetic acid ;