for the following products
2,3-Dihydro-5,6-dimethoxy-2-(4-piperidinylmethyl)-1H-inden-1-one hydrochloride | 5,6-Dimethoxy-2-(4-piperidylmethyl)-1-indanone hydrochloride | 5,6-Dimethoxy-2-(piperidine-4-yl)methylene-indan-1-one hydrochloride | Donepezil intermediate (II) and 5,6-Dimethoxy-2-(piperidin-4-yl)methyl-indan-1-one hydrochloride
