You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(dimethylamino)ethyl]-2-(5,6-dimethyl-1-benzofuran-3-yl)-N-(pyridin-3-ylmethyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N3O2
assistant