You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 5-ethyl-N-[6-(pyridin-2-ylmethylamino)pyridin-3-yl]thiophene-2-sulfonamide is given. What is its corresponding molecular formula?
user
C17H18N4O2S2
assistant