You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3-[(5R)-8-methoxy-1-(4-methylphenyl)sulfonyl-4-oxo-3,5-dihydro-2H-1-benzazepin-5-yl]propanenitrile ?
user
C21H22N2O4S
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