3-(Dimethylamlno)phenol-d6 is an intermediate in synthesizing Nor Neostigmine-d6 (N824402), a labelled Norneostigmine (N824400). Norneostigmine is a degradation product of Neostigmine (N390010) bromide. Neostigmine impurity. 3-(Dimethylamlno)phenol-d6 is also a labelled analogue of 3-(Dimethylamlno)phenol (D461300).