You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 6-[2-(2,6-dioxopiperidin-3-yl)-1-oxo-3H-isoindol-4-yl]hex-5-ynyl carbonochloridate is given. What is its corresponding molecular formula?
user
C20H19ClN2O5
assistant