donepezil [ 1-benzyl-4-((5,6-dimethoxy-1-indanon)-2-yl)methylpiperidine hydrochloride,Aricept,E 2020,E-2020,E2020,Eisai brand of donepezil hydrochloride,Eranz,Pfizer brand of donepezil hydrochloride,Wyeth brand of donepezil hydrochloride,donepezil hydrochloride,donepezilium oxalate trihydrate ] FDA approved for the treatment of mild to moderate dementia of the Alzheimer type; structure given in first source; RN given refers to HCl; RN for parent cpd not avail 10/92