The molecule is a 2-[(1-benzylpiperidin-4-yl)methyl]-5,6-dimethoxyindan-1-one that has R configuration. It is a conjugate base of a (R)-donepezil(1+). It is an enantiomer of a (S)-donepezil.
(2R)-2-[(1-benzylpiperidin-4-yl)methyl]-5,6-dimethoxy-2,3-dihydroinden-1-one