You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S)-3-cyclohexyl-1-(methylamino)-1-oxopropan-2-yl]sulfanyl-4-methoxy-1H-indole-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27N3O3S
assistant