You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,6S)-N-[(2S)-1-ethylsulfonylpropan-2-yl]-2,6-dimethylazepane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H28N2O3S
assistant