You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[(3-chloro-4-fluorophenyl)sulfonylamino]methyl]-N-(furan-3-ylmethyl)pyridine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15ClFN3O4S
assistant