You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-N-[[2-methoxy-5-[[(4R,5R)-4-methoxy-7-azaspiro[4.5]decan-7-yl]methyl]phenyl]methyl]ethanamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H38N2O2
assistant