You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 3-[1-(5-acetyl-3-ethyl-6-methylpyridin-2-yl)piperidin-4-yl]oxybenzonitrile is given. What is its corresponding molecular formula?
user
C22H25N3O2
assistant