You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(2-chloro-4,5-dimethoxyphenyl)methyl]-N-[2-(2-methoxyphenyl)ethyl]-6-azaspiro[2.5]octane-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H33ClN2O4
assistant