You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-chlorophenyl)-2-[(2Z)-2-[1-(furan-2-yl)ethylidene]hydrazinyl]-5-nitrobenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15ClN4O5S
assistant