You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (2S,4R)-4-[(2,5-dimethoxyphenyl)sulfonylamino]-2-methylpyrrolidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H28N2O6S
assistant