Donepezil Open Ring Impurity
Donepezil IMP 4,5-Dimethoxy-2-[2-oxo-3-[1-(phenylmethyl)-4-piperidinyl]propyl]benl Impurity;2-(3-(1-Benzylpiperidin-4-yl)-2-oxopropyl)-4,5-dimethoxybenzoic Acid