You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[[2-(4-chloro-N-(4-methoxyphenyl)sulfonylanilino)acetyl]-[(2-chlorophenyl)methyl]amino]-N-ethyl-3-phenylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H33Cl2N3O5S
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