You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[[2-[6-chloro-1-(4-chlorobenzoyl)-5-methoxy-2-methylindol-3-yl]acetyl]amino]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H22Cl2N2O5
assistant