You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-(2-chloro-6-methylphenyl)-N-[3-(2,6-dioxopiperidin-4-yl)phenyl]acetamide is given. What is its corresponding molecular formula?
user
C20H19ClN2O3
assistant