You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-(6-azaspiro[2.5]octan-6-yl)-7-[2-(1-methylpiperidin-4-yl)acetyl]-3-oxo-4H-naphthalene-2-carbonitrile into molecular formula.
user
C26H31N3O2
assistant