You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[2-[2-[4-[(2R)-2-[3-(diethylamino)propylsulfonylamino]-4-phenylbutanoyl]phenyl]phenyl]ethyl]-3-methylurea into molecular formula.
user
C33H44N4O4S
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