1-Benzyl-4-((5,6-dimethoxy-1-indanon)-2-yl)methylpiperidine hcl 120011-70-3 142057-77-0 1H-Inden-1-one, 2,3-dihydro-5,6-dimethoxy-2-((1-(phenylmethyl)-4-piperidinyl)methyl)-, hydrochloride Aricept BNAG Donepezil hydrochloride E 2020 E 2020 (pharmaceutical) E-2020 E2020