You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3S)-1-amino-3-methyl-1-sulfanylidenepentan-2-yl]-8-(trifluoromethyl)-2,3,4,9-tetrahydro-1H-carbazole-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24F3N3OS
assistant