You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-benzyl-1-[2-(1H-indol-3-yl)ethyl]-9-methyl-1,4,9-triazaspiro[5.5]undecane-2,5-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H30N4O2
assistant