You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[(2S)-butan-2-yl]-2-[[2-(4-ethoxy-N-(4-methylsulfanylphenyl)sulfonylanilino)acetyl]-[(4-methoxyphenyl)methyl]amino]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C33H43N3O6S2
assistant