You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3-cyanophenyl)methyl]-2-[2-[(2-methylimidazol-1-yl)methyl]pyrrolidin-1-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H23N5O
assistant