You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[(2R)-butan-2-yl]-2-[[2-(5-chloro-2-methyl-N-methylsulfonylanilino)acetyl]-[(2-methylphenyl)methyl]amino]-3-phenylpropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H38ClN3O4S
assistant