You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(2S)-2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-thiophen-2-ylethyl]methanesulfonamide by IUPAC nomenclature, provide its molecular formula.
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C16H20N2O2S2
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