You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butyl-2-[(2,4-dichlorophenyl)methyl-[2-(2-methoxy-5-methyl-N-methylsulfonylanilino)acetyl]amino]-3-phenylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H37Cl2N3O5S
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