You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R,2R)-2-(dimethylamino)cyclopentyl]-2-(2,2,6,6-tetramethylpiperidin-4-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H35N3O
assistant