You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule N-[(2S)-2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-[4-(dimethylamino)phenyl]ethyl]propane-2-sulfonamide ?
user
C22H31N3O2S
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