You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named [5-chloro-2-[2-[(2R,5S)-4-[(3,4-difluorophenyl)methyl]-2,5-dimethylpiperazin-1-yl]-2-oxoethoxy]pyridin-3-yl]methanesulfonic acid is given. What is its corresponding molecular formula?
user
C21H24ClF2N3O5S
assistant