You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-3-[[(2S)-2-(1H-indol-2-yl)piperidin-1-yl]methyl]thiolane 1,1-dioxide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N2O2S
assistant