You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-O'-ethyl 2-O'-methyl (2'R,3S,3'S,5'S)-5'-(4-methoxyphenyl)-2-oxospiro[indolizine-3,4'-pyrrolidine]-2',3'-dicarboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H24N2O6
assistant