Donepezil Deoxy Impurity

1-benzyl-4-((5,6-dimethoxy-2,3-dihydro-1H-inden-2-yl)methyl)piperidine|1-Benzyl-4-((5,6-dimethoxy-2,3-dihydro-1H-inden-2-yl)methyl)piperidine;|1-Benzyl-4-[(5,6-dimethoxyindan-2-yl)methyl] piperidine|1-Benzyl-4-[(5,6-dimethoxyindan-2-yl)methyl] piperidine hydrochloride ;|1-Benzyl-4-[(5,6-dimethoxyindan-2-yl)methyl]piperidine;|Deoxy Donepezil Impurity;|Donepezil Deoxy Impurity ;|Donepezil Deoxy Impurity;