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![Donepezil deoxy impurity; 1-Benzyl-4-[(5,6-dimethoxy-2,3-dihydro-1H-inden-2-yl)methyl]piperidine hydrochloride; Donepezil impurity I](/upload/image/thumb/2_600_600_20250318202503181048.jpg)
3-Pyridinesulfonic acid
