You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-(3-cyclopentylpropanoyl)-2-[2-(1H-imidazol-5-yl)ethyl]-2,9-diazaspiro[5.5]undecan-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H34N4O2
assistant