You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 3-[(2-chlorophenyl)-(2-ethoxycarbonyl-5-methoxy-1H-indol-3-yl)methyl]-5-methoxy-1H-indole-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H29ClN2O6
assistant