You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methoxy-N-[(1R)-1-(5,6,7,8-tetrahydronaphthalen-2-yl)ethyl]piperidine-1-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H28N2O3S
assistant