You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 5-[3-(1-aminoethyl)piperidin-1-yl]sulfonyl-2,3-dihydro-1-benzofuran-2-carboxylate into molecular formula.
user
C18H26N2O5S
assistant