Tolterodine Methoxy Propylamine Impurity Racemate

Tolterodine Methoxy Propylamine Impurity Racemate is a stereoisomeric mixture derived from the methoxy-substituted propylamine side chain of Tolterodine. It retains the quinuclidine core but features an ester-linked methoxy group at the propylamine terminus, differing from the parent compound's ethylamino configuration. The racemic form arises from loss of stereochemical control during synthetic steps. This impurity serves as an HPLC reference standard for quantifying enantiomeric purity in Tolterodine active pharmaceutical ingredients.