You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-[(3S,4R)-3-methoxy-4-(methylsulfonylmethyl)piperidin-1-yl]piperidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H34N2O5S
assistant