You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-2-[(2-oxo-1,3-dihydrobenzimidazol-5-yl)sulfonylamino]-N-(oxolan-2-ylmethyl)benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4O5S
assistant