You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule tert-butyl N-[2-[2-oxo-2-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]ethyl]sulfanylethyl]carbamate into molecular formula.
user
C18H35N3O3S
assistant