You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[5-chloro-3-[2-[4-(4-chloro-3-methoxyphenyl)piperazin-1-yl]-2-oxoethyl]-2-oxobenzimidazol-1-yl]acetic acid is given. What is its corresponding molecular formula?
user
C22H22Cl2N4O5
assistant