You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[(2S)-butan-2-yl]-2-[(2-fluorophenyl)methyl-[2-[(2-methylphenyl)methylsulfanyl]acetyl]amino]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H31FN2O2S
assistant